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': 'In which type of nerve fibers is conduction blocked maximally by pressure \nSelect and explain. \nA. A alpha, B. A beta, C. A gamma, D. C', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]