Most efforts to combat such mosquito-borne diseases like malaria and

Dear Friends,

Here is a detailed explanation to this question-

Concepts tested here: Parallelism + Idioms

• “neither A nor B” and “either A or B” are idiomatic uses and are only used when referring to two elements; A and B must be parallel.
• “like” is used for comparing nouns, “as” is used for comparing actions/clauses, and “such as” is used for giving examples.

A: This answer choice fails to maintain parallelism between A ("on the vaccination of humans") and B ("exterminating mosquitoes with pesticides") in the idiomatic construction "either A or B"; please remember, “neither A nor B” and “either A or B” are idiomatic uses and are only used when referring to two elements; A and B must be parallel. Further, Option A incorrectly uses the unidiomatic construction "such...like" to provide the examples of "malaria" and "dengue"; please remember, “like” is used for comparing nouns, “as” is used for comparing actions/clauses, and “such as” is used for giving examples.

B: This answer choice incorrectly uses the unidiomatic construction "such...like" to provide the examples of "malaria" and "dengue"; please remember, “like” is used for comparing nouns, “as” is used for comparing actions/clauses, and “such as” is used for giving examples.

C: This answer choice fails to maintain parallelism between A ("vaccinating humans") and B ("on exterminating mosquitoes with pesticides") in the idiomatic construction "either A or B"; please remember, “neither A nor B” and “either A or B” are idiomatic uses and are only used when referring to two elements; A and B must be parallel.

D: This answer choice fails to maintain parallelism between A ("vaccinating of humans") and B ("on extermination mosquitoes with pesticides") in the idiomatic construction "either A or B"; please remember, “neither A nor B” and “either A or B” are idiomatic uses and are only used when referring to two elements; A and B must be parallel.

E: Correct. This answer choice correctly maintains parallelism between A ("vaccinating humans") and B ("exterminating mosquitoes with pesticides") in the idiomatic construction "either A or B". Further, Option E correctly uses the idiomatic construction "such...as" to provide the examples of "malaria" and "dengue".

Hence, E is the best answer choice.

To understand the concept of "Like" vs "As" on GMAT, you may want to watch the following video (~1 minute):



To understand the concept of "Either-Or" and "Neither-Nor" on GMAT, you may want to watch the following video (~1 minute):



All the best!
Experts' Global Team