Which of the following is a not correct about a randomized controlled trial? A randomized

Which of the following is a not correct about a randomized controlled trial? A randomized controlled trial is usually conducted using a population representative study A well-conducted randomized controlled trial should be free from confounding and selection bias It would be unethical to conduct a randomized controlled trial of alcohol reduction in heavy alcohol users In a randomized controlled trial participants are randomly assigned to intervention or placebo Testing the effects of alcohol reduction in heavy alcohol users is not quite the same as testing the effect of assigning people who do not drink alcohol to alcohol use

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