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': 'Heat labile instruments for use in surgical procedures can be best sterilized by - \nSelect and explain. \nA. Absolute alcohol, B. Ultraviolet rays, C. Chlorine releasing compounds, D. Ethylene oxide gas', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `d' i.e., Ethylene oxide gas", 'role': 'assistant'}]