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
All factors governing dentine permeability EXCEPT 
Select and explain. 
A. Smear Layer, B. Fluid Convection, C. Length of dentinal tubules, D. Diffusion coefficient
B: Fluid Convection
Answer: B: Fluid Convection 
Explanation: None