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': 'Dormia basketing is used for removal of renal calculi in the - \nSelect and explain. \nA. Pelvic ureteric juction, B. Upper 1/3 of ureter, C. Middle 1/3 of ureter, D. Lower 1/3 of ureter', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]