Dear Friends,
Here is a detailed explanation to this question-
jyotsnasarabu wrote:
In his research paper, Dr. Frosh, medical director of the Payne Whitney Clinic, distinguishes
mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis.
(A) mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis
(B) mood swings , perhaps violent without being grounded in mental disease, and genuine manic-depressive psychosis
(C) between mood swings, which may be violent without being grounded in mental disease, and genuine manic-depressive psychosis
(D) between mood swings, perhaps violent without being grounded in mental disease, from genuine manic-depressive psychosis
(E) genuine manic-depressive psychosis and mood swings, which may be violent without being grounded in mental disease
[spoiler=]
https://www.nytimes.com/1986/07/20/arts/music-view-pondering-the-link-between-music-and-madness.html Concepts tested here: Idioms + Awkwardness/Redundancy• “distinguish A from B” and “distinguish between A and B” are the only two correct usages of “distinguish”.
A: Trap. This answer choice is needlessly wordy, as "their" can be deleted without a loss of clarity.
B: This answer choice incorrectly uses the unidiomatic construction “distinguishes A (“mood swings”) and B (“genuine manic-depressive psychosis”)” rather than one of the idiomatic constructions “distinguish between A and B” and “distinguish A from B”; please remember, “distinguish A from B” and “distinguish between A and B” are the only two correct usages of “distinguish”.
C: Correct. This answer choice correctly uses the idiomatic construction “distinguishes between A ("mood swings") and B ("genuine manic-depressive psychosis")”. Further, Option C is free of any awkwardness or redundancy.
D: This answer choice incorrectly uses the unidiomatic construction “distinguishes between A (“mood swings”) from B (“genuine manic-depressive psychosis”)” rather than one of the idiomatic constructions “distinguish between A and B” and “distinguish A from B”; please remember, “distinguish A from B” and “distinguish between A and B” are the only two correct usages of “distinguish”.
E: This answer choice incorrectly uses the unidiomatic construction “distinguishes A (“genuine manic-depressive psychosis”) and B (“mood swings”)” rather than one of the idiomatic constructions “distinguish between A and B” and “distinguish A from B”; please remember, “distinguish A from B” and “distinguish between A and B” are the only two correct usages of “distinguish”.
Hence, C is the best answer choice.To understand the concept of using "Distinguish" on GMAT, you may want to watch the following video (~1 minute):
All the best!
Experts' Global Team
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