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 drugs act by inhibiting bacterial protein synthesis ? 
Select and explain. 
A. Bacitracin, B. Dapsone, C. Ethambutol, D. Streptomycin
D: Streptomycin
Answer: D: Streptomycin 
Explanation: None