This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallbladder, Subject name: Surgery
[{'content': 'Cholangiography T-tube done after how many days of cholecystectomy: \nSelect and explain. \nA. 1-5 days, B. 7-10 days, C. 10-14 days, D. 15-20 days', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cholangiography T-tube done after 7-10 days of cholecystectomy.', 'role': 'assistant'}]