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
In posterior teeth, cusp tip is the best site for EPT. The response is best at which of the following cusp: 
Select and explain. 
A. Distobuccal., B. Mesiobuccal., C. Mesiolingual., D. Distolingual.
B: Mesiobuccal.
Answer: B: Mesiobuccal. 
Explanation: Highest density of A delta fibers is at pulp horn.