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': 'FDA approved locally delivered minocycline for subgingival placement is marketed under trade name \nSelect and explain. \nA. periochip, B. atridox, C. arestin, D. elyzol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]