This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Ophthalmology
[{'content': 'Which drug can cause macular toxicity when given intravitreally ? \nSelect and explain. \nA. Gentamicin, B. Vancomycin, C. Dexamethasone, D. Ceftazidime', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Gentamycin causes macular infarction (retinotoxic). Preferably the aminoglycosides should be avoided intravitreally. Ref : Khurana page no. 169', 'role': 'assistant'}]