This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
Oil and Grease are sterilized by: 
Select and explain. 
A. Hot air oven, B. Autoclaving, C. Filtration, D. Irradiation
A: Hot air oven
Answer: A: Hot air oven 
Explanation: Ans: A (Hot air oven) Ref: A nanthana ray an, Paniker CJ. Textbook of microbiology. 8th Edition. London: John Wiley & Sons: 2009. Pg. 30-38.Explanation: (See table below) Disinfectant/ SterilisationActive againstUseEthyl alcoholBactericidal but not sporicidalSkin antisepticsMethyl alcoholActive against bacterial and fungal sporesCabinets & incubatorsIsopropyl alcoholBactericidal but not sporicidalDisinfection of suture material, clinical thermometersFormaldehydeBactericidal, sporicidal & virucidalOT fumigationGlutaraldehydeBactericidal, sporicidal & virucidal (less toxic/irritant)Bronchoscopes, endoscopes, cystoscopesHypochloriteBactericidal, sporicidal & virucidalBlood spillChlorhexidineBactericidal, mo cerate sporcidal & virucidalTreatment of woundsEthylene oxideBactericidal, sporicidal & virucidal(highly penetrating gas)Heart lung machines, respirators, dental equipmentAutoclaveAll organismsDressings, instruments, media, linenHot air ovenAll organismsGlassware, Glass syringes, Grease, oi. liquid paraffin, dusting powder