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 most commonly associated with which study design \nSelect and explain. \nA. Case control, B. Coho, C. RCT, D. Field trial', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Recall bias is caused by differences in the accuracy or completeness of the recollections retrieved by study paicipants regarding events or experiences from the past. (inaccurate recollection) Recall bias seen in retrospective studies like the case-control study. Ref : Park 23rd edition Pgno : 73', 'role': 'assistant'}]