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
Which of the following is a main ingredient of denture cleaning powder or tablets? 
Select and explain. 
A. Hydrogen peroxide, B. Detergents, C. Sodium perborate, D. Alkaline compounds
C: Sodium perborate
Answer: C: Sodium perborate 
Explanation: All the denture cleansing powders and tablets contain detergent, flavouring agent, alkaline compounds and sodium perborate. The main component is sodium perborate. It decomposes in water to form a peroxide solution which inturn breaks down to liberate oxygen. These oxygen bubbles are the ones that remove the debri on the denture surface.
Phillip’s 12th edition page 494