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': 'Most common type of optic nerve glioma is – \nSelect and explain. \nA. Gemistocytic, B. Fibrous, C. Protoplasmic, D. Pilocytic', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Most common type of optic nerve glioma is juvenile pilocytic astrocytoma.', 'role': 'assistant'}]