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: Dental
The optimal time to employ an orthodontic appliance that takes advantage of growth is during: 
Select and explain. 
A. Late mixed dentition, B. Early mixed dentition, C. Late primary dentition, D. Early permanent dentition
A: Late mixed dentition
Answer: A: Late mixed dentition 
Explanation: None