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: Pathology
[{'content': 'On one side kidney is normal, while other side kidney is contracted with scar, what is the most probable diagnosis? \nSelect and explain. \nA. Chronic pyelonephritis, B. Polycystic kidney, C. Renal artery stenosis, D. Tuberculosis of kidney', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]