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
The bleaching material used for night guard vital tooth bleaching is 
Select and explain. 
A. Superoxol, B. Anesthetic ether and hydrochloric acid, C. Sodium bicarbonate, D. Carbamide peroxide
D: Carbamide peroxide
Answer: D: Carbamide peroxide 
Explanation: None