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
Which of the following carries fast pain: 
Select and explain. 
A. A-alfa, B. A-delta, C. B, D. C
B: A-delta
Answer: B: A-delta 
Explanation: A-delta fibers are associated with fast pain They are myelinated Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:73