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: Pharmacology
[{'content': 'Tetracycline is more preferred in periodontics because: \nSelect and explain. \nA. It is broad spectrum antibiotic, B. It has anticollagenolytic effect, C. All of the above, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]