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
Superoxol is: 
Select and explain. 
A. 30% H2O2, B. Combination of H2O2 + sodium perborate, C. Combination of HCl + H2O2, D. None of the above
A: 30% H2O2
Answer: A: 30% H2O2 
Explanation: Superoxol - 5 parts H2O2 : 1 part ether
Hydrogen peroxide is a powerful oxidizer that is available in various strengths, but 30% to 35% stabilized solutions (Superoxol, Perhydrol) are the most common. 
These high-concentration solutions must be handled with care because they are: Unstable, lose oxygen quickly, and may explode unless they are refrigerated and kept in a dark container. Also, these are caustic chemicals and will burn tissue on contact.