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': 'The primary tooth which erupts at 6-8 months of age: \nSelect and explain. \nA. Central incisor., B. Lateral incisor., C. Canine., D. 1st molar.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sequence of eruption of primary teeth\n\nA – 4-6 months\nB – 6-8 months\nD – 12-16 months\nC – 16-20 months\nE – 20-30 months', 'role': 'assistant'}]