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': 'Elaboration of inactivating enzymes are the important mechanism of drug resistance among all of these antibiotics EXCEPT : \nSelect and explain. \nA. Quinolones, B. Penicillin, C. Chloramphenicol, D. Aminoglycosides', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Resistance to fluoroquinolones is mediated by mutation in DNA gyrase.', 'role': 'assistant'}]