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': 'Pain of dry socket is experienced on: \nSelect and explain. \nA. 1st day after extraction, B. 2nd day after extraction, C. 3rd day after extraction, D. after 7 days', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]