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': 'Which of the following is/are dentin desensitizing agent? \nSelect and explain. \nA. Potassium salts, B. 33% sodium fluoride solution, C. Strontium salts, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Dentin\xa0desensitizers\xa0are materials\xa0used\xa0over\xa0open dentinal tubules on exposed root surfaces to eliminate fluid flow and\xa0desensitize dentin.', 'role': 'assistant'}]