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': 'Blood supply of prelaminar optic nerve is \nSelect and explain. \nA. Short posterior ciliary arteries, B. Branch retinal artery, C. Ophthalmic artery, D. Meningeal arteries', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]