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': 'The treatment of choice in renal cell carcinoma with the tumor of less than 4 cm in size is - \nSelect and explain. \nA. Partial nephrectomy, B. Radical nephrectomy, C. Radical nephrectomy + post operative radiotherapy, D. Radical nephrectomy + chemotherapy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]