This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Elaboration of inactivating enzymes are the impoant mechanism of drug resistance among all of these antibiotics except 
Select and explain. 
A. Quinolone, B. Pencillin, C. Chloramphenicol, D. Aminoglycoside
A: Quinolone
Answer: A: Quinolone 
Explanation: Refer KDT 6/e p688 Resistance to fluoroquinolone is mediated by mutation in DNA gyrase