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 root completion of permanent teeth is achieved
after _________ years of eruption: 
Select and explain. 
A. 1 - 1 ½, B. 3-Feb, C. 4-Mar, D. 5-Apr
B: 3-Feb
Answer: B: 3-Feb 
Explanation: None