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
What should be the concentration of hydrogen peroxide when used for home bleach technique? 
Select and explain. 
A. 3 - 7.5%, B. 7 - 10%, C. 15 - 25%, D. 35%
A: 3 - 7.5%
Answer: A: 3 - 7.5% 
Explanation: Hydrogen peroxide - H2O2 can be used alone or mixed with sodium perborate into a paste for use in the “walking bleach”.
H2O2 concentrations ranging from 3 to 7.5% are used for home bleach.

Textbook of Endodontics Nisha GARG 3rd ED