The following is an example of what kind of study? Participants are recruited based on exposure status as ascertained through historical records (medical records or other records from the past), disease status is determined after recruitment, and risk of disease among the exposed is then compared with risk in the unexposed. a) Ecological study b) cross-sectional study c) case control study d) cohort study e) randomized control trial

The following is an example of what kind of study? Participants are recruited based on exposure status as ascertained through historical records (medical records or other records from the past), disease status is determined after recruitment, and risk of disease among the exposed is then compared with risk in the unexposed. a) Ecological study b) cross-sectional study c) case control study d) cohort study e) randomized control trial