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: “Ethylene oxide used mainly by industry for the sterilization of plastic and other thermolabile material that cannot withstand heating" - Greenwood 16th /ep. 74.\n\nOther methods for sterilization of heat labile instruments\n\n- Ionizing radiation\n- Formaldehyde in combination with subatmospheric steam.', 'role': 'assistant'}]