This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics), Subject name: Microbiology
The operating temperature in an ethylene oxide sterilization during a warm cycle is 
Select and explain. 
A. 49-63oC, B. 92- 110oC, C. 20-35oC, D. 68-88oC
A: 49-63oC
Answer: A: 49-63oC 
Explanation: Ethylene Oxide sterilization (High level disinfectant) Cold cycle stas at 37 + 5 oC Warm cycle stas at 54 + 5 oC ETO is Highly penetrating gas It is used for sterilizing plastic ,rubber paicles , Respirators, Hea lung machine , disposable plastic syringes , petri dishes Bacillus Globigi used as biological indicator for ethylene oxide sterilizer