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': '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 - \nSelect and explain. \nA. Schistosomiasis, B. Amyloidosis, C. Tuberculosis, D. Ca urinary bladder', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]