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
A pt. Ramu presents with hematuria for many days.On investigations he is found to have renal calculi, calcifications in the wall of urinary bladder and small contracted bladder; most probable cause is - 
Select and explain. 
A. Schistosomiasis, B. Amyloidosis, C. Tuberculosis, D. Ca urinary bladder
A: Schistosomiasis
Answer: A: Schistosomiasis 
Explanation: None