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': 'Nerve fibres carrying fast pain is \nSelect and explain. \nA. Aα fibres, B. Aδ fibres, C. B fibres, D. C fibres', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fast pain is carried by Aδ fibres\nSlow pain is carried by C fibres', 'role': 'assistant'}]