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 ideal time of repair of cleft lip is: \nSelect and explain. \nA. At birth, B. Between 3-6 months of age, C. At 1-1 ½ years of age, D. At 1½ to 2 years of age', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]