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': 'Which of the following is the most effective intravesical therapy for superficial bladder cancer? \nSelect and explain. \nA. Mitomycin, B. Adriamycin, C. Thiotepa, D. BCG', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e. BCG", 'role': 'assistant'}]