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
All are aminoglycosides except : 
Select and explain. 
A. Netilmycin, B. Streptomycin, C. Kanamycin, D. Azithromycin
D: Azithromycin
Answer: D: Azithromycin 
Explanation: None