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': 'When do we have to start antibiotics to prevent post-operative infection? \nSelect and explain. \nA. 2 days before surgery, B. After surgery, C. 1 week before surgery, D. 1 hour before surgery & continue after surgery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Prophylactic antibiotics are administered before the skin incision is made. Repeat dosing occurs at an appropriate interval, usually 3 hours for abdominal cases or twice the half-life of the antibiotic.\nPerioperative antibiotic prophylaxis generally is not continued beyond the day of surgery.', 'role': 'assistant'}]