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 macrolide antibiotics EXCEPT 
Select and explain. 
A. Erythromycin, B. Roxithromycin, C. Neomycin, D. Clarithromycin
C: Neomycin
Answer: C: Neomycin 
Explanation: None