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: Unknown
[{'content': 'Preferred time for prophylactic antibiotic administration for surgery: \nSelect and explain. \nA. 1 day before surgery, B. At the time of induction of an anesthesia, C. I.V during surgery, D. Through I.M route before 6 hr of surgery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans- B', 'role': 'assistant'}]