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
Rate of Dentinal fluid permeability depends on all except? 
Select and explain. 
A. Temperature variation, B. Pressure gradient across dentinal tubule, C. Increase viscosity of dentinal fluid, D. Rate of removal of substances by blood vessels
A: Temperature variation
Answer: A: Temperature variation 
Explanation: None