This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'sterilization accuracy is assessed by using ? \nSelect and explain. \nA. clostridium perfringens, B. geobacillus stereothermophilus, C. clostridium butyricum, D. bacillus subtilis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: TYPES OF BIOLOGICAL INDICATORS : BIOLOGICAL INDICATORS contain the bacterial spores used for monitoring. The spores used are Geobacillus stearothermophilus (for testing steam or chemical vapor sterilization) or Bacillus subtilis (for testing dry-heat or ethylene oxide gas sterilization). Currently, no BIs are available for routine testing of liquid chemical sterilants or disinfectants. Demonstrating the death of bacterial spores provides the main guarantee of sterilization, because it assess the process directly using live resistant microorganisms. Using bacterial spores to monitor the sterilization process is referred to as biologic monitoring (or spore-testing) and the bacterial spores used for monitoring the sterilization process are referred to as biologic indicators (BIs). REF : ANANTHANARYANA 9TH ED', 'role': 'assistant'}]