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
Ideal Time to start an orthodontic treatment is? 
Select and explain. 
A. Primary Dentition, B. Early Mixed Dentition, C. Late Mixed Dentition, D. When the malocclusion first seen
D: When the malocclusion first seen
Answer: D: When the malocclusion first seen 
Explanation: None