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
Which among the following is the best irrigant for the removal of the smear layer: 
Select and explain. 
A. H2O2, B. NaOCl., C. H2O2+NaOCl., D. EDTA.
C: H2O2+NaOCl.
Answer: C: H2O2+NaOCl. 
Explanation: H2O2 + NaOCl (best for removal of smear layer). 
NaOCl should be used last to avoid surgical emphysema caused by H2O2