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: Dental
[{'content': 'All of the following can be used for sterilization of hand piece except: \nSelect and explain. \nA. Autoclave, B. Chemical vapour sterilization, C. ETOX, D. Dry heat sterilization', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Autoclave sterilization of hand pieces is one of the most rapid methods of sterilization. However, fibre optics dim with repeated heat sterilization in several months to a year, apparently owing to oil residue and debris baked on the ends of the optical fibres.\nChemical vapour sterilization is recommended for some types of hand pieces- apparently works well with ceramic -bearing hand pieces.\nETOX (ethylene oxide) gas is the greatest method of sterilization used for hand pieces.\nDry heat sterilization of hand pieces is generally not recommended.', 'role': 'assistant'}]