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
True about transitional cell Ca of urinary bladder 
Select and explain. 
A. Smoking predisposes, B. Schistosoma infection predisposes, C. Aniline dye workers, D. All
D: All
Answer: D: All 
Explanation: Answer is 'a' i.e. Smoking predisposes; 'b' i.e. Schistosoma infection predisposes; 'c' i.e. Aniline dye workers