In an experiment to test the effect of a new weight loss drug, half of the people in the study received the drug, and the other half received a placebo (a pill that has no physiological effect). In addition, only males from the ages of 20 to 25 were

selected to participate in the study. All participants received their treatments (drug or placebo) every day for 4 weeks. Which of the following components of the study design served as the control group?

A) The 4-week length of the experiment.
B) The restriction of study participants in age and gender.
C) The participants who received a placebo.
D) The participants who received the drug.


Answer: C

Biology & Microbiology

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