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Get access to the detailed solutions to the previous year's questions asked in XAT exam.
From the passage, it is clear the that double-blind, placebo-controlled clinical trial is unbiased, gives no chance for the clinician to choose patients nor does the patient know if he is getting the drug or the placebo and moreover it reflects the calculus exemplified by the deli-counter episode. In no way does this trial increase the overall efficiency of the drug. So the correct answer is A.