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
[{'content': 'Which of the following antibiotic does not act by inhibiting protein synthesis ? \nSelect and explain. \nA. Vancomycin, B. Tetracycline, C. Streptomycin, D. Azithromycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]