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': 'At what time is the crown completed for the tooth indicated? \nSelect and explain. \nA. Primary maxillary central incisor, 3 weeks., B. Permanent maxillary central incisor, 2 to 3 years., C. Primary maxillary lateral incisor, 2 to 3 months., D. Permanent maxillary lateral incisor, 2 to 3 years.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The correct answer for A would be about 1.5 months or 6 weeks; B, About 4 to 5 years; C, About 2.5 months or 10 weeks; D, About 4 to 5 years.', 'role': 'assistant'}]