<prompt> Interstitial nephritis is common withNSAIDBlack water feverRhabdomyolysisTumor lysis syndrome  <response>: Ans. a NSA1DRef: Harrison 19th ed. 1856Choices B,C,D lead to acute tubular necrosis and hence by exclusion the answer is A.Causes of Acute Interstitial Nephritis Drugs like beta lactams, quinolones, NSAID,COX-2 inhibitors, phenytoin, valproate and P.P.I Infections like streptococcus, staphylococcus Connective tissue disorder like SLE, Sjogren Light chain nephropathy Urate nephropathyCauses of Chronic Interstitial Nephritis V.U.R Sickle cell disease Hypokalemic nephropathy 