780 Patients Suffering from High Blood Pressure Were Randomly Assigned

780 patients suffering from high blood pressure were randomly assigned to one of three groups.Over a four-month period,the first group received an experimental drug,the second group received a placebo,and the third group received no treatment.The diastolic blood pressure of each participant was measured at the beginning and at the end of the period and the change in blood pressure was recorded.The biggest decrease in blood pressure was for those who received the drug.

A) Retrospective observational study
B) Prospective observational study
C) Experiment

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