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': 'A 2-hour-old Avulsed tooth is best stored in medium that contains: \nSelect and explain. \nA. Tetracycline, B. Dexamethasone, C. Ampicillin, D. Ibuprofen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]