determine whether the given description corresponds to an observational study or an experiment. In each case, give a brief explanation of your choice.
Clinical Trial In a clinical trial of the cholesterol drug Lipitor, 188 subjects were given 20-mg doses of the drug, and 3.7% of them experienced nausea (based on data from Pfizer, Inc.).
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Because the subjects were given a treatment consisting of Lipitor, this is an experiment.