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': 'Fibres least susceptible to pressure are: \nSelect and explain. \nA. A, B. B, C. C, D. D', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Relative susceptibility of mammalian A, B and C nerve fibers to conduction block produced by various agents:', 'role': 'assistant'}]