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You are designing a case control study of 100 men with prostate cancer. What is the ONE essential prerequisite of the control group? - The

You are designing a case control study of 100 men with prostate cancer. What is the ONE essential prerequisite of the control group? - The answer is not C. Have already done this and was marked wrong

A.

The controls should be from both hospital and community settings.
B.

Controls should be from hospital settings but should be subsets of many different diagnostic categories.
C.

Controls should be matched to eliminate confounders.
D.

Controls should be free from prostate cancer.

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