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
Which of the following antibiotic does not act by inhibiting protein synthesis ? 
Select and explain. 
A. Vancomycin, B. Tetracycline, C. Streptomycin, D. Azithromycin
A: Vancomycin
Answer: A: Vancomycin 
Explanation: None