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: Microbiology
[{'content': 'The operating temperature in an ethylene oxide sterilization during warm cycle is : \nSelect and explain. \nA. 20-350C, B. 49-630C, C. 68-880C, D. 92-1100C', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]