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': 'Which is the most common cause of papillary necrosis \nSelect and explain. \nA. Analgesics abuse, B. Chronic alcoholism, C. Acute pyelonephritis, D. Diabetes mellitus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Though all the options are causes of renal papillary necrosis, most common cause is Diabetes mellitus.', 'role': 'assistant'}]