Question ID:PT7 S4 Q18 Passage:In clinical trials of new medicines, half of the subjects receive the drug being tested and half receive a physiologically inert substance—a placebo. Trials are designed with the intention that neither subjects nor experimenters will find out which subjects are actually being given the drug being tested. However, this intention is frequently frustrated because_______. Stem:Which one of the following, if true, most appropriately completes the explanation? Correct Answer Choice:AChoice A:often the subjects who receive the drug being tested develop symptoms that the experimenters recognize as side effects of the physiologically active drug Choice B:subjects who believe they are receiving the drug being tested often display improvements in their conditions regardless of whether what is administered to them is physiologically active or not Choice C:in general, when the trial is intended to establish the experimental drug’s safety rather than its effectiveness, all of the subjects are healthy volunteers Choice D:when a trial runs a long time, few of the experimenters will work on it from inception to conclusion Choice E:the people who are subjects for clinical trials must, by law, be volunteers and must be informed of the possibility that they will receive a placebo