What is the "placebo effect"? a. The physical response to a medication that contains active ingredients for treating a specific condition. b. The worsening of symptoms due to negative beliefs or expectations. c. When a person's physical or mental health appears to improve after taking a placebo or 'dummy' treatment. d. The side effects experienced after taking a medication containing active agents such as an actual vaccine.. 2. Why do we sometimes use a placebo in a randomized controlled trial? a. To deliberately worsen the condition of participants in the control group. b. Because we would not want a treatment, such as a vaccine, to appear to "work" (in this case to ward off the disease) if it we were just measuring a "placebo effect." c. To confirm that all participants have the same medical condition. d. To increase the cost and complexity of the trial.

What is the "placebo effect"? a. The physical response to a medication that contains active ingredients for treating a specific condition. b. The worsening of symptoms due to negative beliefs or expectations. c. When a person's physical or mental health appears to improve after taking a placebo or 'dummy' treatment. d. The side effects experienced after taking a medication containing active agents such as an actual vaccine.. 2. Why do we sometimes use a placebo in a randomized controlled trial? a. To deliberately worsen the condition of participants in the control group. b. Because we would not want a treatment, such as a vaccine, to appear to "work" (in this case to ward off the disease) if it we were just measuring a "placebo effect." c. To confirm that all participants have the same medical condition. d. To increase the cost and complexity of the trial.