A study of a new medication found that patients who took the medicine have reduced blood pressure, compared to those who did not take the medicine. The research team concluded that the medicine caused the reduction in blood pressure. Which study design did they most likely use?

This clinical study makes use of a study design called Randomized Controlled Trial. A study undergoing RCT involves the study of a new treatment or drug. People who undergo RCT either get the treatment being studied or the standard treatment (placebo or no treatment). This kind of study is suitable for those who want to eliminate biases in their study.