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 a tooth, which has been endodontically treated, there\nis pain on percussion and slight mobility due to: \nSelect and explain. \nA. Loose crown, B. Tooth fracture, C. Psychosomatic, D. Eccentric contact', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]