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Which of the following is an example of a negative control? a. In an experiment to test the effectiveness of a new painkiller, a subset of patients is given a sugar pill (a placebo), rather than the actual painkiller.b. In an experiment to test the effectiveness of a new painkiller, a subset of patients is given aspirin, a proven painkillerc. In an experiment to test the effectiveness of a new painkiller, a subset of patients is given the experimental painkiller.
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