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
Preferred time for cleft lip repair surgery is 
Select and explain. 
A. 5 - 6 months, B. 6 - 12 months, C. 12 - 18 months, D. 12 - 24 months
A: 5 - 6 months
Answer: A: 5 - 6 months 
Explanation: U/L cleft lip : 5 - 6 months.
Bilateral cleft lip : 4 - 5 months.