Question ID:PT51 S3 Q1 Passage:Studies have shown that treating certain illnesses with treatment X produces the same beneficial changes in patients' conditions as treating the same illnesses with treatment Y. Furthermore, treatment X is quicker and less expensive than treatment Y. Thus, in treating these illnesses, treatment X should be preferred to treatment Y. Stem:Which one of the following, if true, would most weaken the argument above? Correct Answer Choice:AChoice A:Unlike treatment Y, treatment X has produced harmful side effects in laboratory animals. Choice B:There are other illnesses for which treatment Y is more effective than treatment X. Choice C:Until recently, treatment X was more expensive than treatment Y. Choice D:Treatment Y is prescribed more often by physicians than treatment X. Choice E:A third treatment, treatment Z, is even quicker and less expensive than treatment X.