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': 'Mechanism of action of tetracycline is - \nSelect and explain. \nA. Binds to A site and inhibit attachment of t-RNA., B. Inhibits peptidyl transferase, C. Causes misreading of mRNA, D. Causes termination of peptide chain elongation', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Bind to A site and inhibit attachment of t-RNA", 'role': 'assistant'}]