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
Treatment of hypersensitive dentin is: 
Select and explain. 
A. Plaque removal, B. Burnishing  dentine  with  33%  sodium  fluoride/Kaolin/ glycerine paste, C. Obturation of carious lesions, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Hydrodynamic theory best explains dentin hypersensitivity.
The  cervi c a l  region  of   teeth  is   the  most  common  site  of  hypersensitivity.