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: Anaesthesia
[{'content': 'Which of the following nerve fibers are first to get blocked by local anaesthetic \nSelect and explain. \nA. A alpha, B. A beta, C. A delta, D. A gamma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sequence of block is\nBeta > A delta = C > A gamma > A beta >A alpha', 'role': 'assistant'}]