This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cleft Lip & Palate, Subject name: Surgery
[{'content': 'Unilateral cleft lip is repaired at what age? \nSelect and explain. \nA. 1-3 months, B. 3-6 months, C. 6-9 months, D. 9-12 months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANSWER: (B) 3-6 monthsREF: With textDefinitive single-stage cleft lip and nose repair is performed at 3 to 6 months of age. After the definitive deft lip and nose repair, the deft palate is repaired in a single stage at 9 to 12 months of age. (Ref: Schwartz 9th ed chapter 45)The timing of cleft repair is important, and a general recommendation is lip repair at 3 months, palate repair by 12 months, and alveolar bone grafting at about 9 years which coincides with partial eruption of the canine teeth (Ref: Sabiston 18th ed chapter 73)Cleft lip repair is commonly performed between 3 and 6 months of age whereas deft palate repair is frequently performed between 6 and 18 months. (Ref: Bailey 25th ed page 661)', 'role': 'assistant'}]