This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Not a carcinogen for bladder cancer? 
Select and explain. 
A. Benzidine, B. Isopropyl alcohol, C. Acrolein, D. Phenacetin
B: Isopropyl alcohol
Answer: B: Isopropyl alcohol 
Explanation: 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