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': 'Which of these features is a classic radiologic feature of optic nerve glioma: \nSelect and explain. \nA. Tram-track appearance of optic nerve, B. Kingking of optic nerve, C. Multiple cystic spaces in optic nerve, D. Adjacent bony erosion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Kingking of optic nerve', 'role': 'assistant'}]