This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pre Anesthetic Evaluation, Subject name: Anaesthesia
[{'content': 'The best time period to give preoperative antibiotics : \nSelect and explain. \nA. Within 1 hour prior to incision, B. Within 6 hour prior to incision, C. Just before incision, D. Just before induction of anaesthesia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is best to give antibiotics within 1 hour prior to surgical site incision. There is two exception to this rule i. Vancomycin should be given 2 hours prior ii. When tourniquet is used it should be given before inflation of tourniquet. The most common organisms implicatedas causes of surgical site infections include: staphylococcus aureus staphylococcusepidermidis aerobic streptococci anaerobic cocci', 'role': 'assistant'}]