When an investigational drug is being assessed in clinical trials for its potential use in medical treatment, the three groups design offers the advantage of
a. allowing researchers to determine which of three diseases is most successfully treated using the investigational drug.
b. allowing researchers to determine whether the investigational drug provides any advantage over a placebo.
c. allowing researchers to determine whether the investigational drug provides any advantage over an already established pharmaceutical.
d. both a. and b. are correct.
e. both b. and c. are correct.
Answer: E
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