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': 'Mean value articulator is: \nSelect and explain. \nA. 3 point articulator., B. Non-adjustable articulator., C. Non arcon type articulator., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]