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': 'Disinfection duration of alginate impression, when immersion method is used, should not exceed \nSelect and explain. \nA. 10 min, B. 20 min, C. 5 min, D. 30 min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Feedback \nThe current protocol for disinfecting hydrocolloid impression is to use household bleach 1:10 dilution , iodophors or synthetic phenols. The time of immersion should not exceed 10min, when immersion method is used.', 'role': 'assistant'}]