Question: A study is designed to evaluate the impact of a daily multivitamin on students' academic performance. One hundred sixty students are randomly assigned to receive either the multivitamin or a placebo and are instructed to take the assigned drug daily for 20 days.

On day 20 , each student takes a standardized exam and the mean exam scores are compared between groups. This study is an example of a

1. randomized controlled trial
2. case-control study
3. cohort study
4. crossover trial

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