Which of the following is the BEST reason to include a placebo in the experimental design of a human intervention trial?
A) The researchers do not know who is receiving an intervention and who is not.
B) Placebos reduce the cost of the study.
C) It helps prevent the expectations of the subjects from biasing the research.
D) It makes it possible to include a larger number of subjects in the experiment.
Correct Answer:
Verified
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A)A
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