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': 'Optic nerve fibres once cut, do not regenerate because they are not covered by: \nSelect and explain. \nA. Myelin sheath, B. Neurilemma, C. Both of the above, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Neurilemma', 'role': 'assistant'}]