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 Gothic arch tracing device is used to record \nSelect and explain. \nA. The vertical dimension of occlusion, B. The centric relation, C. The centric occlusion, D. Vertical dimension at rest', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]