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
Tetracyclines inhibit protein synthesis by : 
Select and explain. 
A. Inhibition of initiation and misreading of mRNA, B. Binding to 30 S subunit and inhibiting the binding of aminoacyl–tRNA to A site, C. Inhibiting peptidyl transferase activity, D. Inhibiting translocation
B: Binding to 30 S subunit and inhibiting the binding of aminoacyl–tRNA to A site
Answer: B: Binding to 30 S subunit and inhibiting the binding of aminoacyl–tRNA to A site 
Explanation: None