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
All are precancerous for carcinoma bladder except - 
Select and explain. 
A. Tuberculosis bladder, B. Aniline dyes, C. Schistosomiasis, D. All
A: Tuberculosis bladder
Answer: A: Tuberculosis bladder 
Explanation: Ans. is 'a' i.e. Tuberculosis bladder