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
The Browne's tube is used for? 
Select and explain. 
A. Steam sterilization, B. Radiation, C. Chemical sterilization, D. Filtration
A: Steam sterilization
Answer: A: Steam sterilization 
Explanation: A brownie's tube(green spot) is available for dry heat and is convenient for routine use. After prolonged sterilization, a green color is produced REF:Ananthanarayan and Panicker's Textbook of Microbiology 8th Edition pg no:32