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
Crown completion of Mandibular Canine occur 
Select and explain. 
A. At birth, B. 6-7 years, C. 11-12 years, D. 8-9 years
B: 6-7 years
Answer: B: 6-7 years 
Explanation: None