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: Medicine
[{'content': 'All of the following are causes of granular contracted kidney except - \nSelect and explain. \nA. Benign nephrosclerosis, B. Chronic pyelonephritis, C. Diabetes mellitus, D. Chronic glomerulonephritis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]