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': 'Which of the following types of bias can be reduced by by allowing equal interview time- \nSelect and explain. \nA. Berkesonian bias, B. Recall bias, C. Selection bias, D. Interviewer bias', 'role': 'user'}, {'content': "Answer: D \nExplanation: Interviewer's bias Occur when interviewer knows the hypothesis and know who the cases are. This type of bias can be eliminated by double-blinding. (refer pgno:74 park 23 rd edition)", 'role': 'assistant'}]