This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Tetracyclines inhibit protein synthesis by: \nSelect and explain. \nA. Inhibition of initiation and misreading of mRNA, B. Binding to 30 S subunt and inhibiting the binding of aminoacyl-RNA to A site, C. Inhibiting peptidyl transferase activity, D. Inhibiting translocation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The tetracyclines are primarily bacteriostatic; inhibit protein synthesis by binding to 305 ribosomes in susceptible organism. Subsequent to such binding, attachment of aminoacyl-t-RNA to the mRNA-ribosomc complex is interferred with. ESSENTIALS OF MEDICAL PHARMACOLOGY page no. 734', 'role': 'assistant'}]