GMAT Practice Question Set #18 (Question 52-54)

Sentence Correction Question #52: Causes of Skin Conditions  
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Lately medical researchers have observed that some skin conditions are not caused by fatty foods, drugs, or stress, but a microbial organism that dwells below the surface of the skin.

(A)

not caused by fatty foods, drugs, or stress, but

(B)

caused not by fatty foods, drugs, or stress, but

(C)

not caused by fatty foods, drugs, or stress, but are by

(D)

caused not by fatty foods, drugs, or stress, but by

(E)

caused not by fatty foods, drugs, or stress, but are by

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