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
[{'content': 'Transitional cell carcinoma of bladder is associated with-a) Schistosomiasisb) Naphthylaminec)  Smokingd)  TB bladder \nSelect and explain. \nA. ab, B. abc, C. acd, D. bcd', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]