This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics), Subject name: Microbiology
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: Brown's tube is the most commonly used chemical indicator of moist heat sterilization in the autoclave. It contains red solution that turns green when exposed to temperature of 121degC for 15 minutes in an autoclave.