This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'What is choledocholithotomy \nSelect and explain. \nA. Removal of ureteric stone, B. Removal of gall stone, C. Removal of gall bladder, D. Removal of common bile duct stone', 'role': 'user'}, {'content': "Answer: D \nExplanation: Choledocholithotomy is a procedure in which we are draining the CBD and removing the stones by a longitudinal incision in the duct. Reference:Bailey & Love's sho practise of surgery,25 th edition ,page no:1126", 'role': 'assistant'}]