<prompt> Not a carcinogen for bladder cancer?BenzidineIsopropyl alcoholAcroleinPhenacetin  <response>: Ans. is b i.e., Isopropyl alcohol Risk factors for transitional cell carcinoma TCC of bladder ? Smoking -4 Major etiological factor. Occupational exposure to chemicals - Nephthylamine benzidine, aniline dyes, acrolein. Schistosoma haematobium Bilharziasis- It is a risk factor for both TCC SCC. Drugs -- Phenacetin Cyclophosphamide therapy Pelvic irradiations 