This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiological Study, Subject name: Social & Preventive Medicine
[{'content': 'All are true about Case control study EXCEPT: \nSelect and explain. \nA. Attribute risk, B. Measurement of exposure, C. Matching, D. Odds ratio', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Attribute riskRef.: K. Park 23rd ed. / 71-72Case control study is often called retrospective study.The 4 Basic Steps of Case Control Study* Matching* Measurement of exposure* Selection of cases and controls* Analysis and interpretation (relative risk)Relative Risk =Incidence among exposed--------------------------Incidence among non-exposed', 'role': 'assistant'}]