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
Oil and grease are sterilised by- 
Select and explain. 
A. Hot air oven, B. Autoclaving, C. Filtration, D. Irradiation
A: Hot air oven
Answer: A: Hot air oven 
Explanation: None