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
[{'content': 'Crown completion of Deciduous Maxillary Canine occur \nSelect and explain. \nA. At birth, B. 1 ½ month after birth, C. 2 ½ months after birth, D. 9 months after birth', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]