Madagascar periwinkle

[vaibhav.iit2002]

A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, is cultivated in China as part of a program to integrate traditional herbal medicine into a contemporary system of health care.
(A) A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients,
(B) A derivative, which has proved useful in decreasing mortality among young leukemia patients, of the Madagascar periwinkle,
(C) A Madagascar periwinkle derivative, which has proved useful in decreasing mortality among young leukemia patients,
(D) The Madagascar periwinkle has a derivative which has proved useful in decreasing mortality among young leukemia patients, that
(E) The Madagascar periwinkle, a derivative of which has proved useful in decreasing mortality among young leukemia patients,

[umaa]

IMO B.


A - WHICH refers periwinkle. Wring
C - A Madagascar periwinkle derivative - Wrong; Its a derivative from A Madagascar periwinkle
D - A Madagascar periwinkle HAS a derivative - sounds wrong.

E - A Madagascar periwinkle is not a derivative.



OA pls.

[riteshbindal]

A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, is cultivated in China as part of a program to integrate traditional herbal medicine into a contemporary system of health care.
(A) A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, --> which refers to periwrinkle. Wrong
(B) A derivative, which has proved useful in decreasing mortality among young leukemia patients, of the Madagascar periwinkle, --> It makes the sentence look like derivative is cultivated in China. WRONG
(C) A Madagascar periwinkle derivative, which has proved useful in decreasing mortality among young leukemia patients, --> Again it makes the sentence look like that the derivative is cultivated in China. WRONG.
(D) The Madagascar periwinkle has a derivative which has proved useful in decreasing mortality among young leukemia patients, that --> "that" doesn't have any particular reference. WRONG.
(E) The Madagascar periwinkle, a derivative of which has proved useful in decreasing mortality among young leukemia patients,--> CORRECT

E IMO. OA please.

[vaibhav.iit2002]

A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, is cultivated in China as part of a program to integrate traditional herbal medicine into a contemporary system of health care.
(A) A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, --> which refers to periwrinkle. Wrong
(B) A derivative, which has proved useful in decreasing mortality among young leukemia patients, of the Madagascar periwinkle, --> It makes the sentence look like derivative is cultivated in China. WRONG
(C) A Madagascar periwinkle derivative, which has proved useful in decreasing mortality among young leukemia patients, --> Again it makes the sentence look like that the derivative is cultivated in China. WRONG.
(D) The Madagascar periwinkle has a derivative which has proved useful in decreasing mortality among young leukemia patients, that --> "that" doesn't have any particular reference. WRONG.
(E) The Madagascar periwinkle, a derivative of which has proved useful in decreasing mortality among young leukemia patients,--> CORRECT

E IMO. OA please.

I think the original sentence suggests that the derivative and not Madagascar periwinkle is cultivated in China, so whats problem with C?

How do you infer from original sentence that Madagascar periwinkle is cultivated in China?

[riteshbindal]

I think that Madagascar periwrinkle should be cultivated.
See, the sentence means, a substance derived from Madagascar periwrinkle is useful. And let's suppose something is cultivated. Now, a derivative is coming from "something" so it can not be cultivated.
Logically, Madagascar periwrinkle is being cultivated here and the derivative is used by people.
Did I explain it properly?

[vaibhav.iit2002]

I think that Madagascar periwrinkle should be cultivated.
See, the sentence means, a substance derived from Madagascar periwrinkle is useful. And let's suppose something is cultivated. Now, a derivative is coming from "something" so it can not be cultivated.
Logically, Madagascar periwrinkle is being cultivated here and the derivative is used by people.
Did I explain it properly?

Yes u have explained it nice.
I have doubt because the subject of sentence is derivative and the fragment between commas acts as modifier for Madagascar periwrinkle and thus grammatically derivative should be cultivated but logically(as u said) Madagascar periwrinkle should be.

[riteshbindal]

Yeah I know. These confusing subjects sometimes kill. You have to get everything clicking in your mind correctly in actual GMAT Will be tough to do in pressure.
All the best.

[riteshbindal]

BTW, I just saw that both of us have same target GMAT score and both of us joined BTG just in 4 days gap Best of luck!
Oops... Editing this post. gap is not 4 days. It's one year and 4 days lol