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 Denar articulator belong to \nSelect and explain. \nA. Class II-A, B. Class I, C. Class III-B, D. Class IV', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]