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': 'Touch is carried by: \nSelect and explain. \nA. A beta, B. A delta, C. C fibers, D. Both 1 and 2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Numerical classification of sensory nerve fibers:', 'role': 'assistant'}]