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': 'AION is seen in which of the following conditions \nSelect and explain. \nA. Chronic simple glaucoma, B. Gaint cell aeritis, C. Chronic iridocyclitis, D. Sarcoidosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANTERIOR ISCHAEMIC OPTIC NEUROPATHY(AION) refers to ischaemic damage to the optic nerve head from occlusion of the sho posterior ciliary aeries. It is of two types : Aeretic AION - results from inflammatory and thrombotic occlusion of sho posterior ciliary aeries caused by Giant Cell Aeritis (GCA) , usually occurs in older patients (mean age 70 yrs) and accounts for only 5-10% cases of AION. Non aeretic AION - accounts for 90 - 95% cases of AION. Exact etiology of occlusion of posterior ciliary aeries causing infarction of the retrolaminar poion of the disc is not known. Risk factors include cataract surgery , HTN, diabetes , drugs (sildenafil). Ref: khurana 6th edition page no.318', 'role': 'assistant'}]