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': 'After exploration of common bile duct, the T- Tube is removed on whcih of the following days - \nSelect and explain. \nA. 3 postop.day, B. 4 postop. day, C. 12 postop.day, D. 6 postop day', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]