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': 'Following are the possible positions of vertical dimension (or Vertical dimension can be classified as following); Except \nSelect and explain. \nA. Vertical dimension at rest., B. Vertical dimension at occlusion or occlusal vertical dimension., C. Vertical dimension in other positions of mandible., D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Classification:\n\nVertical dimension at rest.\nVertical dimension at\xa0occlusion or occlusal vertical dimension.\nVertical dimension in other positions of mandible.\nVertical dimension at rest and occlusion are the two measurable guides and need to be determined.', 'role': 'assistant'}]