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: Unknown
[{'content': 'Most common type of RCC associated with dialysis: \nSelect and explain. \nA. Clear cell CA, B. Papillary CA, C. Medullary CA, D. Chromophobe', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Papillary CA', 'role': 'assistant'}]