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 process of exfoliation of primary teeth is between 
Select and explain. 
A. Seventh and eight years, B. Seventh and ninth years, C. Seventh and tenth years, D. Seventh and twelfth years
D: Seventh and twelfth years
Answer: D: Seventh and twelfth years 
Explanation: None