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: Surgery
[{'content': 'Prophylactic antibiotic in surgical practice: \nSelect and explain. \nA. is given orally, B. depends on individual preference, C. continued for a minimum of 7 days, D. first dose is given before induction of anesthesia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]