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': 'According to Ellis and Deway classification, displacement of tooth without fracture if crown or root is: \nSelect and explain. \nA. Class 6, B. Class 7, C. Class 8, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]