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': 'Primary closure of incised wounds must be done within \nSelect and explain. \nA. 2 hrs, B. 4 hrs, C. 6 hrs, D. 12 hrs', 'role': 'user'}, {'content': 'Answer: C \nExplanation: • Primary suture:\n−− Clean wounds\n−− Selected contaminated wounds after thorough wound toileting and debridement\n• Delayed primary suture:\n−− Heavily contaminated wounds\n−− Wounds in which wound toileting has been delayed for 6–8 hours\n• Left open to heal by secondary closure', 'role': 'assistant'}]