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': 'Most common type of renal cancer is \nSelect and explain. \nA. Medullary, B. papillary, C. chromophobe, D. Clear cell cancer', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Clear cell Ca is most common. It usually involves PCT', 'role': 'assistant'}]