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': 'Most common form of disinfection of alginate impression material is \nSelect and explain. \nA. Spraying 1% sodium hypochlorite, B. Spraying 5% sodium hypochlorite, C. Immersing in 1% sodium hypochlorite, D. Immersing in 5% sodium hypochlorite', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The\xa0 current\xa0 protocol\xa0 for\xa0 disinfecting\xa0 hydrocolloid impressions recommended by the Centers for Disease Control\xa0and Prevention is to use household bleach (1-to-10 dilution), iodophors, or synthetic phenols as disinfectants.\xa0\nGuide for selection of Appropriate Disinfection Method for Impressions Transported to a Dental Laboratory', 'role': 'assistant'}]