This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'True about A- delta fibers \nSelect and explain. \nA. Associated with slow pain, B. Associated with fast pain, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A-delta fibers are associated with fast pain They are myelinated but conduction velocity is least among A fibers. Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 73', 'role': 'assistant'}]