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': 'Commonest treatment of Branchial cyst- \nSelect and explain. \nA. Cystectomy, B. Aspiration, C. Excision, D. Nothing done', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]