This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Case control studies are used for - \nSelect and explain. \nA. Study of common disease, B. Finding multiple risk factors, C. Finding incidence rates, D. Finding relative risk', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Case control study: Proceeds from effect to cause Stas with the disease Tests whether the suspected cause occurs more frequently in those with the disease than those without the disease (refer pgno:79 park 23rd edition)', 'role': 'assistant'}]