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': 'A 40 year old patient is suffering from carotid body tumor. Which of the following is the best choice of treatment for him? \nSelect and explain. \nA. Excision of tumor, B. Radiotherapy, C. Chemotherapy, D. Carotid aery ligation both proximal and distal to the tumor', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Excision of tumour", 'role': 'assistant'}]