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 undeaken 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: Ans. is 'b' i.e., Is at least 8 kg. in weight and thriving 10 kg is given in both Bailey & Schwaz", 'role': 'assistant'}]