This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
[{'content': 'The recommended time for prophylactic antibiotic is: \nSelect and explain. \nA. 30 min prior to induction of anesthesia, B. 15 min after the initiation of surgery, C. At the time of induction, D. At the time of skin incision', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) 30 min prior to induction of anesthesia(Ref: Katzung 11th/e p898)Antibiotic should be present in adequate concentration at the operative site before incision and throughout the procedure.Parenteral agents should be administered during the interval beginning 60 minutes before incision; administration up to the time of incision is preferred.', 'role': 'assistant'}]