This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitreous and retina, Subject name: Ophthalmology
[{'content': 'Drugs causing macular toxicity when given intiavitreally- \nSelect and explain. \nA. Gentamycin, B. Vancomycin, C. Dexamethasone, D. Ceftazidime', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref:comprehensive ophthalmology AK Khurana 4th edition page no :152 Gentamycin is 4 times more retinotoxic (causes macular infarction) than amikacin. Preferably the aminoglycosides should be avoided. \x01', 'role': 'assistant'}]