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: Ophthalmology
[{'content': 'Occlusion of sho posterior ciliary aeries may cause: \nSelect and explain. \nA. Ischaemic optic neuropathy, B. Posterior segment ischaemia, C. Anterior segment ischaemia, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Ischaemic optic neuropathy', 'role': 'assistant'}]