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
Touch is carried by: 
Select and explain. 
A. A beta, B. A delta, C. C fibers, D. Both 1 and 2
D: Both 1 and 2
Answer: D: Both 1 and 2 
Explanation: Numerical classification of sensory nerve fibers: