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
Patient having tooth fracture without involving pulp
having sensitivity is due to 
Select and explain. 
A. Fluid flow in dentinal tubules, B. Stimulation of nerve ending, C. Due to extensive pressure created by occlusal contacts, D. Due to change in intrapulpal pressure
A: Fluid flow in dentinal tubules
Answer: A: Fluid flow in dentinal tubules 
Explanation: None