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
Following does not assist in locating Root canal Orifices? 
Select and explain. 
A. H2O2, B. NaOCl, C. DG 16 endodontic probe, D. Dentinal Map
A: H2O2
Answer: A: H2O2 
Explanation: NaOCl is used in Champagne Bubble test. DG 16 is endodontic explorer