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
Transitional cell carcinoma bladder caused by 
Select and explain. 
A. Schistosomiasis, B. Ascariasis, C. Malaria, D. None
A: Schistosomiasis
Answer: A: Schistosomiasis 
Explanation: Risk factors for transitional cell carcinoma (TCC) of the 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 → Phenacetin 
5. Cyclophosphamide therapy 
6. Pelvic irradiation