This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve Physiology, Subject name: Physiology
Which of the following types of nerve fibers carry pain - 
Select and explain. 
A. A- alpha, B. A-beta, C. A- gamma, D. A-delta
D: A-delta
Answer: D: A-delta 
Explanation: Ans- D.