Sentence Correction

kvcpk wrote:Want to confirm:

"its" refers to parasite or snail?

IMO A

host for is the correct Idiom.
its is used for parasite.

Another great explanation provided by Ron: https://www.manhattangmat.com/forums/vie ... &view=next

I wish he told me earlier about the possessive poison, which is hard to get rid of...

Both A and C are correctly written, but they have different meaning in whose life cycle the author is describing, the snails or the parasite. Because the original sentence is correct as written in referring to the parasite's life cycle, we should not change the meaning of the sentence by selecting C and replacing 'its' with 'their'. The trap in this question was to tempt you to do this by hoping you would confuse the word "parasite's" as being plural.

Comment in MGMAT sounds like plausible.
* "Schistosomiasis" and "it" are both SUBJECTS --> parallel
* "parasite's" and "its" are both POSSESSIVES --> parallel