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': 'An aminoglycoside that is often combined with\npolymyxin and bacitracin for the treatment of\ntopical infection is \nSelect and explain. \nA. Gentamycin, B. Tetracycline, C. Aztreonam, D. Neomycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]