This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney & Ureturs, Subject name: Surgery
[{'content': 'IVP of an old male 75 years is shown below- Diagnosis is \nSelect and explain. \nA. Bladder cancer, B. BPH, C. Calculi in bladder, D. Thimble bladder', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Bladder cancer* The IVP cystogram shows a filling defect in left side of bladder.* It looks like a mass like filling defect in TCC bladder', 'role': 'assistant'}]