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
Transmission of stimulus across dentin is 
Select and explain. 
A. Direct activation of nerve endings, B. Correlated with the innervation density of the dentin, C. Stimulus induced fluid flow, D. There is no transmission of stimulus across dentin
C: Stimulus induced fluid flow
Answer: C: Stimulus induced fluid flow 
Explanation: None