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': 'Best prognosis among RCC is \nSelect and explain. \nA. Clear cell, B. Papillary, C. Chromophobe, D. Collecting duct', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chromophobe has best prognosis\nCollecting duct has the worst prognosis.', 'role': 'assistant'}]