A randomized clinical trial is a study in which __________.
A. all subjects are treated the same, to see what percentage of the total gets better, what percentage stays the same, or what percentage gets worse
B. people are assigned to different types of treatment in alternating alphabetical order, to see which treatment is best
C. people go through different treatments in random order, to see which one works best
D. people are assigned to different groups based on a flip of the coin; one half goes to a treatment group and the other to a seemingly identical placebo group
Answer: D
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Fill in the blank with the appropriate word.