Although perioral dermatitis rashes are believed to be caused by reactions to Sodium Laurel Sulfate (SLS) found in shampoos and other personal care products, instructing patients to eliminate all products with SLS frequently does not stop
the perioral dermatitis. Obviously, some other cause of perioral dermatitis besides reactions to SLS must exist.
Which of the following, if true, would most seriously weaken the conclusion above?

Question

Examsnet · Accepted Answer

Correct Answer is :  Skin allergies affect many people who never develop the symptom of perioral dermatitis.

GMAT Verbal Reasoning Practice Test 1