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 distance between Junctional epithelium and alveolar\nbone: \nSelect and explain. \nA. increases with age, B. decreases with age, C. Remains constant, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]