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': 'Epidermoid carcinoma of renal pelvis is usually associated with - \nSelect and explain. \nA. Multiple papilomas, B. Pelvic calculus, C. Tuberculosis of kidney, D. Filariasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]