This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bladder Cancer, Subject name: Surgery
[{'content': 'Which of the following is used in urinary bladder carcinoma? \nSelect and explain. \nA. 5FU, B. BCG, C. Cyclophosphamide, D. 6 Mercapto Purine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Amns. (b) BCGRef: Sabiston Textbook of surgery 18th ed Table 77-6', 'role': 'assistant'}]