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': 'Pain is carried by which type of nerve fibres ? \nSelect and explain. \nA. aa, B. Ab, C. B, D. C', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., C", 'role': 'assistant'}]