This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'Most common cause of Papillary necrosis is \nSelect and explain. \nA. Diabetes Mellitus, B. Sickle cell anaemia, C. Analgesics, D. Pyelonephritis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Major causes of Papillary Necrosis1. Analgesic nephropathy2. Sickle cell nephropathy3. Diabetes with UTI4. Prolonged NSAID use Reference: Harrison&;s Principles of Internal Medicine; 19th edition; Chapter 340; Tubulointerstitial Diseases of the Kidney', 'role': 'assistant'}]