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: Dental
Dull, boring, gnawing type of pain is due to excitation of: 
Select and explain. 
A. C fibres., B. A delta fibres., C. Both., D. None.
A: C fibres.
Answer: A: C fibres. 
Explanation: Dull, boring, gnawing, and excruciating. This kind of painful response is consistent with those resulting from excitation and slower rate of transmission of the "C" nerve fibers in the pulp