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
Which is a form of cold sterilization - 
Select and explain. 
A. Gamma rays, B. Beta rays, C. Infrared rays, D. Autoclave
A: Gamma rays
Answer: A: Gamma rays 
Explanation: Ionising radiations:Xray ,Gamma rays Cold sterilisation is a process in which sterilisation is carried out at a low temperature with the help of chemicals,radiations,membranes and all other means excluding higher temperature REF:Ananthanarayan & Panicker's Textbook of Microbiology 9th edition pg no:33