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': 'The best treatment for cystic hygroma is - \nSelect and explain. \nA. Surgical excision, B. Radiotherapy, C. Sclerotherapy, D. Chemotherapy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Definitive treatment is complete excision of the cyst at an early age.', 'role': 'assistant'}]