In a drug study,a _____ is a harmless substance with no physiological effect that is given to participants in a control group so that they are treated identically to the experimental group except for the active agent.

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A placebo is a harmless substance given to participants in a control group to ensure that they are treated identically to the experimental group, except for the active agent being studied. This helps researchers determine whether any observed effects of the active agent are due to the drug itself or simply due to participants' expectations or other factors. The other choices (B) confederate, (C) sample, and (D) confound, do not accurately describe the role or purpose of a placebo in a drug study.

In a Drug Study,a _____ Is a Harmless Substance with No