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
[{'content': 'Treatment of hypersensitive dentin is: \nSelect and explain. \nA. Plaque removal, B. Burnishing  dentine  with  33%  sodium  fluoride/Kaolin/ glycerine paste, C. Obturation of carious lesions, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hydrodynamic theory best explains dentin hypersensitivity.\nThe\xa0 cervi c a l\xa0 region\xa0 of\xa0 \xa0teeth\xa0 is\xa0 \xa0the\xa0 most\xa0 common\xa0 site\xa0 of\xa0\xa0hypersensitivity.', 'role': 'assistant'}]