<prompt> The drug which causes renal papillary necrosis is?AcetophenetidinGentamicinGoldMethicillin  <response>: Ans. a AcetophenetidinRef: Robbiris pathology 9th ed. 423. 936t Renal papillary necrosis due to acetophenetidin phenacetin is a gradual process with slow loss of renal function. The most common cause of renal papillary necrosis is diabetic glomerulopathy 