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': 'The bacterial resistance to tetracycline is due to: \nSelect and explain. \nA. Alteration of drug binding sites, B. Alteration of dehydrofolate reductase, C. Inactivation of drug by enzymes, D. Decreased uptake of drug by bacteria', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]