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
In the recent decade Gonococcus become resistant to all the following drugs, EXCEPT: 
Select and explain. 
A. Penicillin G, B. Azithromycin, C. Tetracycline, D. Ciprofloxacin
B: Azithromycin
Answer: B: Azithromycin 
Explanation: Treatment azithromycin 1g po single dose till now not repoed resistance. Ref: KDT, 6th Edition, Page 737