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': 'Recall bias is more common with \nSelect and explain. \nA. Coho study, B. Randomized control trial, C. Cross sectional study, D. Case control study', 'role': 'user'}, {'content': 'Answer: D \nExplanation: When cases and controls are asked questions about their past history it may be more likely for the cases to recall the existence of ceain events or factors than the controls who are healthy. (refer pgno:73 park 23rd edition)', 'role': 'assistant'}]