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 operative treatment in Hirschsprung's disease is only undertaken when child - \nSelect and explain. \nA. Is 2 years of age, B. Is at least 8 kg in weight and thriving, C. Has no distension of abdomen, D. Has failed to respond to conservative treatment", 'role': 'user'}, {'content': 'Answer: B \nExplanation: • A diagnosis of Hirschsprung’s disease requires surgery in all cases.\n• The classic surgical approach consisted of a multiple-stage procedure.\n• This included a colostomy in the newborn period, followed by a definitive pull-through operation after the child weighed > 10 kg.', 'role': 'assistant'}]