This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Renal carcinoma with solitary lung secondary is best treated by \nSelect and explain. \nA. Radiotherapy, B. Surgery, C. Chemotherapy, D. Immunotherapy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Surgery is the best option because 1) cytoreductive surgery will help in increase the action of immunotherapy 2) metstatectomy ( surgery to remove metstatectomy ) with curative intent has good prognosis in pulmonary Mets Ref : Campbell and Walsh urology 11th edition . chapter 63. pg no 1502', 'role': 'assistant'}]