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': 'All of the following are true about case control study except- \nSelect and explain. \nA. Rapid and inexpensive, B. No risk to subjects, C. Risk factor can be identified, D. Less prone to bias', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bias in case-control study: Bias due to confounding Memory or recall bias Selection bias Berkesonian bias Interviewers bias (refer pgno:74 park 23 rd edition)', 'role': 'assistant'}]