This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Neoplasia), Subject name: Surgery
[{'content': 'Drug of choice for surgically unresectable renal cell carcinoma is? \nSelect and explain. \nA. Sorafenib, B. Sunitinib, C. Imatinib, D. Cetuximab', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) SunitinibRef: Sabiston Textbook of surgery 18th ed ch-77, NCCN Guidelines Version 1.2013', 'role': 'assistant'}]