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 maximum rate of eruption, as the tooth cusps reach the surface epithelium is around ___________ μm/day. \nSelect and explain. \nA. 100, B. 75, C. 50, D. 25', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]