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
Distraction osteogenesis can be performed as early as? 
Select and explain. 
A. 2 years of age, B. 4 years of age, C. 6 years of age, D. 8 years of age
A: 2 years of age
Answer: A: 2 years of age 
Explanation: None