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': 'Relationship between nerve thickness and conduction velocity of myelinated nerves is: \nSelect and explain. \nA. Linear, B. Parabolic, C. Hyperbolic, D. No relation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fiber\xa0diameter\xa0(thickness)\xa0and\xa0conduction velocity\xa0relationship:\xa0 The\xa0relationship\xa0is\xa0linear\xa0 for\xa0 myelinated\xa0 axons\xa0 and\xa0 parabolic relation for non\xadmyelinated axons.', 'role': 'assistant'}]