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
Unilateral small smooth kidney is seen in - 
Select and explain. 
A. Reflux nephropathy, B. Lobar infarction, C. Renal artery stenosis, D. Chronic glomerulonephritis
C: Renal artery stenosis
Answer: C: Renal artery stenosis 
Explanation: None