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OFFICIAL EXPLANATION



The availability of lay information about the effectiveness of pharmaceuticals vs. natural remedies poses a problem for physicians concerned about patients switching from medications prescribed by qualified practitioners to self-medicating with nutritional supplements.


A. medications prescribed by qualified practitioners to self-medicating with nutritional supplements

Incorrect.

This answer choice is grammatically incorrect. The parallelism from A to B requires that A and B are the same part of speech. Here, however, A is a noun (medications) and B is a verb (self-medicating).

This parallelism is tricky to detect as it does not fall within standard Stop Signs. However, following the lines of other parallelisms (from A to B is similar to A and B, either A or B, not only A but also B, A rather than B) you could surmise that this construction requires both sides of the parallelism to be of the same part of speech and logically parallel.



B. medicating with prescriptions from qualified practitioners to self-medication with nutritional supplements

Incorrect.

This answer choice is grammatically incorrect. The parallelism from A to B requires that A and B are the same part of speech. Here, however, A is a verb (medicating) and B is a noun (self-medication).

In addition, it is illogical to say medicating with prescriptions. One medicates with a drug or a substance, not with a prescription.



C. medications prescribed by qualified practitioners to nutritional supplements being used for self-medication

Incorrect.

While this answer choice corrects the grammatical mistake in the original sentence, it is stylistically flawed. The phrase nutritional supplements being used for self-medication is awkward and wordy. The word being denotes the use of supplements was already ongoing when people switch to them, which makes no sense.

There is an answer choice which conveys the message of the sentence in a clearer and more concise way. Find it!



D. medical prescriptions by qualified practitioners to nutritional supplements for self-medication

Incorrect.

This answer choice is grammatically incorrect. The parallelism from A to B requires that A and B are logically parallel. Here, however, A refers to instructions from the doctor (medical prescriptions) while B refers to the actual substance being used (supplements)



E. using medications prescribed by qualified practitioners to self-medicating with nutritional supplements

This answer choice correctly creates the parallelism from A to B by using two logically parallel V+ing verbs: from using medications ... to self-medicating... .

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