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': 'Household bleach such as chlorox contains: \nSelect and explain. \nA. 2.25% NaOCl, B. 3.25% NaOCl, C. 4.25% NaOCl, D. 5.25% NaOCl', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sodium Hypochlorite\nIt is one of the most widely used irrigating solutions. Household bleach such as chlorox contains 5.25% NaOCl. Some people suggest that it should be used at\xa0this concentration, whereas others suggest that it should\xa0be diluted with water, and still others advice alternating it with other agents, such as EDTA with cetrimide (EDTAC, Roydent Products; Rochester Hills, MI) or\xa0chlorhexidine.', 'role': 'assistant'}]