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': 'Unilateral small smooth kidney is seen in ? \nSelect and explain. \nA. Reflux nephropathy, B. Lobar infarction, C. Renal aery stenosis, D. Chronic glomerulonephritis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Renal aery stenosis", 'role': 'assistant'}]