A Randomized Clinical Trial

A randomized clinical trial

A) is a study where all subjects are treated the same to see what percentage of the total gets better, stays the same, or gets worse.
B) is a study where people are assigned to different types of treatment by the flip of a coin to see which treatment is best.
C) is a study where people go through different treatments in random order to see which one works best.
D) is a study where people are assigned to different groups by a flip of a coin, one-half to a treatment group and one-half to a seemingly identical placebo group.