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
Home bleach is also called as: 
Select and explain. 
A. Walking bleach, B. Thermocatalytic bleach, C. Power bleach, D. All of the above
A: Walking bleach
Answer: A: Walking bleach 
Explanation: Commonly used solutions for nightguard bleaching/home bleaching/walking bleach:

10% carbamide peroxide with or without carbopol
15% carbamide peroxide
Hydrogen peroxide (1–10%)

Indications for home bleaching/night guard bleaching 

Mild generalized staining
Age-related discolorations
Mild tetracycline staining
Mild fluorosis
Acquired superficial staining
Stains from smoking tobacco
Color changes related to pulpal trauma or necrosis