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
Tyndallisation is a type of- 
Select and explain. 
A. Intermittent sterilization, B. Pateurisation, C. Boiling, D. Autoclaving
A: Intermittent sterilization
Answer: A: Intermittent sterilization 
Explanation: A single exposure of 90 minutes usually ensures sterilisation but for media containing sugars or gelatin an exposure of 100 degree celsius for 20 minutes on 3 successive days is used . This is known as tyndallisation or intermittent sterilisation REF:Ananthanarayan and Panicker's Textbook of Microbiology 8th Edition pg no:32