Example of case control study (risk factor and disease/outcome)-

Ans. is 'D' i.e., All of the above o Important risk factors and their outcome&ftiiseases which have been studied by case-control study are Cigarette smoking and lung cancer. Maternal smoking and congenital malformation, Radiation and leukemia. OCP used and hepatocellular carcinoma. Herpes-simplex and Bells palsy. Artificial sweeteners and bladder cancer. DES exposure in fetal life and vaginal adenocarcinoma. OCP use and thromboembolic disease. Thalidomide use in pregnancy and teratogenicity.