This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs, Subject name: Ophthalmology
[{'content': 'Drugs causing macular toxicity when given intravitreally- \nSelect and explain. \nA. Gentamycin, B. Vancomycin, C. Dexamethasone, D. Ceftazidime', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Gentamycino Intravitreal aminoglycosides (gentamycin, amikacin) are a reported cause of macular toxicity.o Aminoglycosides induced macular toxicity is thought to be partially due to the gravity-induced settling of drugs on the macula in supine position.o This may result in a higher concentration of drug locally at the macula.", 'role': 'assistant'}]