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
Tooth whitening strip is: 
Select and explain. 
A. H2O2, B. HF, C. Carbamide peroxide, D. Sodium perborate
A: H2O2
Answer: A: H2O2 
Explanation: Hydrogen peroxide used in dentistry as a whitening agent ranges in concentration between 5 and 35%.
Ref :Grossman’s endodontics,13th edition, pg no:504