This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Neck), Subject name: Surgery
[{'content': 'Best treatment of cystic hygroma is? \nSelect and explain. \nA. Radiotherapy, B. Sclerotherapy, C. Surgical excision, D. Chemotherapy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Surgical excisionRef: Schwartz 9th ed ch-39', 'role': 'assistant'}]