The Primary Difference Between an Experimental (Randomized) Clinical Trial and Other

The primary difference between an experimental (randomized) clinical trial and other observational study designs in epidemiology is that in an experimental trial, the

A) study is prospective.
B) investigator determines who is and who is not exposed.
C) study is case controlled.
D) study and control maps are selected on the basis of exposure to the suspected causal factor.

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