Consider an experiment in which participants take a pill that is either a medication or a placebo. the researchers want to determine the effect of the medication on depression. in this example, the control group would bea. the participants receiving the placebo. b. the participants receiving the medication. c. the medical personnel supplying the pill. d. the researchers conducting the study.

a. the participants receiving the placebo.

Explanation:

Placebo-controlled studies are a method of experimental testing in which, there´s a group of subjects that are given the treatment under evaluation, and the control group gets a placebo treatment that is specially created to have no actual medical effect. The placebo group meant to account for the placebo effect and is required to provide comparable data to analyze whether the treatment works.

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