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
The last solution used in root canal treatment to avoid painful surgical emphysema before dressing is 
Select and explain. 
A. Normal saline, B. EDTA, C. Hydrogen peroxide, D. Sodium hypochlorite
D: Sodium hypochlorite
Answer: D: Sodium hypochlorite 
Explanation: None