This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary Bladder, Subject name: Surgery
Which of the following are suspected carcinogens for bladder carcinoma? 
Select and explain. 
A. Phenacitin, B. Tobacco, C. Aniline dye, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Ans. is 'd' i.e., All the above Risk factors for transitional cell carcinoma (TCC) of bladder -1. Smoking - Major etiological factor.2. Occupational exposure to chemicals - Nephthylamine benzidine, aniline dyes, acrolein.3. Schistosoma haematobium (Bilharziasis) - It is a risk factor for both TCC & SCC.4. Drugs - Phenacetin5. Cyclophosphamide therapy6. Pelvic irradiations