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
Mechanism of action of quinolones is : 
Select and explain. 
A. DNA gyrase inhibitors, B. Bind to 30 S unit of ribosomes and inhibit protein synthesis, C. Bind to bacterial cell membrane, D. Bind to tetra hydro folate reductase
A: DNA gyrase inhibitors
Answer: A: DNA gyrase inhibitors 
Explanation: None