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
[{'content': 'Which among the following is the best irrigant for the removal of the smear layer: \nSelect and explain. \nA. H2O2, B. NaOCl., C. H2O2+NaOCl., D. EDTA.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: H2O2 + NaOCl (best for removal of smear layer).\xa0\nNaOCl should be used last to avoid surgical emphysema caused by H2O2', 'role': 'assistant'}]