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': 'When root canal instruments (files and reamers) are sterilized in a glassbead sterilizer at 450 degree F., they should be placed in the sterilizer for \nSelect and explain. \nA. 2 seconds, B. 5 seconds, C. 10 seconds, D. 20 seconds', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]