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
Site for EPT over anterior teeth: 
Select and explain. 
A. Incisal edges., B. Mid facial surface., C. Incisal third of facial surface., D. Any of the above.
C: Incisal third of facial surface.
Answer: C: Incisal third of facial surface. 
Explanation: Highest density of A delta fibers is at pulp horn.