Retrospective study is -: (A) Case-control study, (B) Cohort study, (C) Cross-sectional study, (D) RCT
Answer is A. Ans. is 'a > b' i.e., Case-control study > Cohort study o Case-control study is a retrospective study.o Cohort study is mostly a prospective study. But retrospective cohort studies are also there (has been explained in previous sessions).