This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'Ocular hallmark of giant cell aeritis is \nSelect and explain. \nA. Papilloedema, B. CRAO, C. AION, D. CRVO', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. AIONThe most common ocular manifestation of giant cell aeritis is visual loss, most commonly secondary to anterior ischemicoptic neuropathy (AION) due to occlusion of sho posterior ciliary aerities.Ophthalmic aery involvement can lead to sudden blindness which is the most feared complication of temporal aeritis.', 'role': 'assistant'}]