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': ". Hirschprung's disease is treated by \nSelect and explain. \nA. Colostomy, B. Excision of aganglionic segment, C. Colectomy, D. Sodium chloride wash", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]