<prompt> The commonest cause of Renal papillary necrosis -Analgesic nephropathyPyelonephritisDiabetesSick cell anemia  <response>: Ans- C Most common cause is DM. Renal papillary necrosis is almost always aw with pyelonephritisPyelonephritis is caused by DM, Analgesic, SCA So MCC is DMMC association is Analgesic Nephropathy. 