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': 'In which of the following displacement and mobility not seen \nSelect and explain. \nA. Subluxation, B. Extrusion, C. Avulsion, D. Concussion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]