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': 'The bleaching material used for night guard vital tooth bleaching is \nSelect and explain. \nA. Superoxol, B. Anesthetic ether and hydrochloric acid, C. Sodium bicarbonate, D. Carbamide peroxide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]