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
Latent period of distraction osteogenesis in 8 months old child is 
Select and explain. 
A. 0-2 days, B. 5-7 days, C. 4-6 weeks, D. 31-40 days
A: 0-2 days
Answer: A: 0-2 days 
Explanation: None