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: Surgery
Which of the following is not a risk factor for transitional cell carcinoma of
urinary bladder 
Select and explain. 
A. Smoking, B. Schistosomiasis, C. Aniline dye, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Risk factors of TCC include

Smoking
Aniline dye
Schistosomiasis
Radiation
Cyclophosphamid