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': 'Group A nerve fibers most susceptible to \nSelect and explain. \nA. Pressure, B. Hypoxia, C. Local anaesthesia, D. Temperature', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]