<prompt> In a case-control study of a suspected association between breast cancer and the contraceptive pill, all of the following are true statements exceptThe control should come from a population that has the same potential for breast cancer as the casesThe control should exclude women known to be taking the pill at the time of the surveyAll the controls need to be healthyThe attributing risk of breast cancer resulting from the pill may be directly measured  <response>: The attributable risk of breast cancer resulting from the pill may be directly measured. AR calculation requires incidence which can be obtained from only a coho study. Reference: Parks textbook of preventive and social medicine, 23rd edition, page no:78 