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 of the following is true about dentinal tubules except: 
Select and explain. 
A. Inner pulpal layer contains more dentinal tubules than outer dentin layer, B. The diameter of dentin tubules ranges from 5 to 7μm, C. The diameter of dentinal tubule is more at pulpal layer than outer layer, D. The bonding is more difficult on the inner Layer of dentin compared to outer surface
B: The diameter of dentin tubules ranges from 5 to 7μm
Answer: B: The diameter of dentin tubules ranges from 5 to 7μm 
Explanation: None