This is a simple GMAT sentence correction question that underlines a relatively small portionof the sentence. The non-underlined portion fo the sentence talks about medical researchers and their findings when it comes to some skin conditions. The sentence suggests that some people might think the cause of these skin conditions may include things such as fatty foods, drugs, or stress. But in actuality, these items are not the cause. Instead, the cause of these skin conditions is the presence of a certain microorganism that is found just beneath the surface of the skin. This microorganism is the real culprit.
So this sentence tries to convey this meaning - but in a single sentence. And your job is to pick the wording the most accurately portrays the above meaning in a way that is consistent with common and business English use.
Of course, some things should jump out at you - for example, the laundry liste of items where all the commas are in the underlined portion of the sentence. And then the keyword "but" at the end of the underlined portion of the sentence.
source: GMAT Pill
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