This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Berkesonian bias is a type of: \nSelect and explain. \nA. Information bias, B. Interviewer bias, C. Selection bias, D. Recall bias', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]