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': 'Which of the following types of nerve fibers carry pain? \nSelect and explain. \nA. A a, B. A b, C. A g, D. A d', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Delta fibres carry pain, cold, touch sensations. Ref: Ganong&;s review of medical physiology; 23rd edition; pg: 89; table 4-1', 'role': 'assistant'}]