This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of the Optic Nerve, Subject name: Ophthalmology
[{'content': 'Which amongst the following is associated with Altitudinal visual field defect: \nSelect and explain. \nA. Optic neuritis, B. AION (Anterior Ischemic Optic Neuropathy), C. Intracranial tumor, D. Papillitis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) AION (Anterior Ischemic Optic Neuropathy)Ref: Harrison's 19th ed. / 202* Anterior Ischemic Optic Neuropathy refers to a segmental or generalized infarction of anterior part of the optic nerve* It occurs due to occlusion of the short posterior ciliary arteries* Visual field defects show typically altitudinal hemianopia involving the inferior (commonly) or superior half.", 'role': 'assistant'}]