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
Any child with caries before_________ years is called ECC: 
Select and explain. 
A. 2 years, B. 3 years, C. 5 years, D. 6 years
D: 6 years
Answer: D: 6 years 
Explanation: None