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 of hard palate is \nSelect and explain. \nA. At birth, B. Between 3-6 months of age, C. Between 12-15 months of age, D. After 2 years of age', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]