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: Physiology
[{'content': 'The regeneration of nerve fibres is possible in the\nperipheral nervous system than the central nervous system because \nSelect and explain. \nA. Presence of neurilemmal sheath in peripheral nerve, B. Presence of neurilemmal sheath in central nervous system, C. The absence of myelin sheath in the central nervous system, D. Disturbed vascular supply', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]