Sentence Correction

Some patients who do not respond to therapies for depression may
simply have received inadequate treatment, having, for example, been
prescribed a drug at a dosage too low to be effective or having been taken
off a drug too soon.
A. having, for example, been prescribed a drug at a dosage too low to be effective
or having been
B. having, for example, a drug prescription that was ineffective because the
dosage was too low, or being
C. as, for example, having too low of a dosage of prescribed drug for it to be
effective, or being
D. when they have, for example, been prescribed too low a drug dosage for it to
be effective, or were
E. for example, when they have a drug prescription with a dosage too low to be
effective, or been

Anybody on this one...???I have no clues what to mark here of the five choices...

ssgmatter wrote:Some patients who do not respond to therapies for depression may
simply have received inadequate treatment, having, for example, been
prescribed a drug at a dosage too low to be effective or having been taken
off a drug too soon.
A. having, for example, been prescribed a drug at a dosage too low to be effective
or having been
B. having, for example, a drug prescription that was ineffective because the
dosage was too low, or being
C. as, for example, having too low of a dosage of prescribed drug for it to be
effective, or being
D. when they have, for example, been prescribed too low a drug dosage for it to
be effective, or were
E. for example, when they have a drug prescription with a dosage too low to be
effective, or been

Anybody on this one...???I have no clues what to mark here of the five choices...

Some thoughts:
1. Comma plus Verbing:
=> Comma plus verbing modifies the previous clause. It means there should be a "noun + verb" before a comma plus verbing.

Now, the sentence in skeleton form is:
Some patients may simply have received inadequate treatment, having X, or having Y. => It is fine as it is.

Reasons:
1. There is a parallelism of "having X, or having Y".
2. It follows the rule of comma plus Verbing.

What about other options?
B, C, and D do not maintain parallelism. In E, "they have X, or been Y" is not parallel.

Answer should be A.

Adding on to the discussion,

in E "they" doesn'thave clear antecedent!!

Well explained by Mr.Perfect Bhai!! Good!!

gmatmachoman wrote:Adding on to the discussion,

in E "they" doesn'thave clear antecedent!!

Well explained by Mr.Perfect Bhai!! Good!!

Hello brother,

tumi ki bangali?

bhai shobdo ta besh mojar to tai koilam r ki.

sobai valo korse. lege thakte hobe r ki.

thanks.

Final solution at one place:

Important: The purpose of this post (and all the other posts by me) is to give a complete solution to all GMAT-Prep Verbal questions at one place. Sometimes students have to wade through dozens of posts to get to the final answer. My posts will give one complete and crisp solution required to arrive at the correct answer by eliminating the wrong ones. Some of the content in these posts may have been taken from various other sources (discussion forums).

Some patients who do not respond to therapies for depression may simply have received inadequate treatment, having, for example, been prescribed a drug at a dosage too low to be effective or having been taken off a drug too soon.
(A) having, for example, been prescribed a drug at a dosage too low to be effective or having been
(B) having, for example, a drug prescription that was ineffective because the dosage was too low, or being
(C) as, for example, having too low of a dosage of a prescribed drug for it to be effective, or being
(D) when they have, for example, been prescribed too low a drug dosage for it to be effective, or were
(E) for example, when they have a drug prescription with a dosage too low to be effective, or been

The best way to attack this problem is to remove 'for example' from each of the choices.

A. having been prescribed a drug at a dosage too low to be effective or having been
B. having a drug prescription that was ineffective because the dosage was too low, or being
C. as having too low of a dosage of a prescribed drug for it to be effective, or being
D. when they have been prescribed too low a drug dosage for it to be effective, or were
E. when they have a drug prescription with a dosage too low to be effective, or been

A is parallel 'having been || having been' ... the connector word is 'or' ... as we are joining two similar ideas (and only two ideas), we should not use a comma. This alone is sufficient to eliminate B, C, D, and E.

In B, 'having a drug prescription (refers to patients) can't be parallel to being taken off (refers to a doctor, possibly) ... as the subjects are different, the two are not parallel.

In C, 'having too low of a dosage (refers to patients) can't be parallel to being taken off (refers to a doctor, possibly) ... as the subjects are different, the two words are not parallel.

D is not parallel ('have been' is not parallel to 'were')

E is not parallel ('have a prescription' is not parallel to 'been taken off')

Correct: A