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': 'Jack stone calculi is seen in which anatomic part - \nSelect and explain. \nA. Prostate, B. Kidney, C. Ureter, D. Bladder', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]