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
Which of the following is the most effective intravesical therapy for superficial bladder cancer? 
Select and explain. 
A. Mitomycin, B. Adriamycin, C. Thiotepa, D. BCG
D: BCG
Answer: D: BCG 
Explanation: Ans. is 'd' i.e. BCG