This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'Operation theatres are sterilized by? \nSelect and explain. \nA. Carbolic acid spraying, B. Washing with soap and water, C. Formaldehyde, D. ETO gas', 'role': 'user'}, {'content': "Answer: C \nExplanation: FORMALDEHYDE GAS is used for sterilizing instruments and heat sensitive catheters and for fumigating wards, sick rooms, and laboratories REF:Ananthanarayan and Panicker's Textbook ofMicrobiology 8thEdition pg no:36", 'role': 'assistant'}]