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': 'What should be the concentration of hydrogen peroxide when used for home bleach technique? \nSelect and explain. \nA. 3 - 7.5%, B. 7 - 10%, C. 15 - 25%, D. 35%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hydrogen peroxide - H2O2 can be used alone or mixed with sodium perborate into a paste for use in the “walking bleach”.\nH2O2 concentrations ranging from 3 to 7.5% are used for home bleach.\n\nTextbook of Endodontics Nisha GARG 3rd ED', 'role': 'assistant'}]