This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Kidney Disease and Uremia, Subject name: Medicine
The commonest cause of Renal papillary necrosis - 
Select and explain. 
A. Analgesic nephropathy, B. Pyelonephritis, C. Diabetes, D. Sick cell anemia
C: Diabetes
Answer: C: Diabetes 
Explanation: Ans- C Most common cause is DM. Renal papillary necrosis is almost always a/w with pyelonephritis(Pyelonephritis is caused by DM, Analgesic, SCA) So MCC is DM&MC association is Analgesic Nephropathy.