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
[{'content': 'True about transitional cell Ca of urinary bladder \nSelect and explain. \nA. Smoking predisposes, B. Schistosoma infection predisposes, C. Aniline dye workers, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Answer is 'a' i.e. Smoking predisposes; 'b' i.e. Schistosoma infection predisposes; 'c' i.e. Aniline dye workers", 'role': 'assistant'}]