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 Deciduous Mandibular Canine occur 
Select and explain. 
A. At birth, B. 1 ½ month after birth, C. 2 ½ months after birth, D. 9 months after birth
D: 9 months after birth
Answer: D: 9 months after birth 
Explanation: None