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 structurally resembles aminoacyl tRNA and also inhibits protein synthesis: \nSelect and explain. \nA. Puromycin., B. Tetracycline., C. Chloramphenicol., D. Sulphonamides.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Puromycin structurally resembles aminoacyl t-RNA and inhibits protein synthesis by causing premature termination. Tetracyclines inhibit the binding of aminoacyl-tRNA to the A site.', 'role': 'assistant'}]