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7507 Social & Preventive Medicine

In a case-control study of a suspected association between breast cancer and the contraceptive pill, all of the following are true statements except

AThe control should come from a population that has the same potential for breast cancer as the cases
BThe control should exclude women known to be taking the pill at the time of the survey
CAll the controls need to be healthy
DThe attributing risk of breast cancer resulting from the pill may be directly measured (Correct Answer)