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
Plasma sterilization accuracy is assessed by using? 
Select and explain. 
A. Bacillus subtilis, B. Bacillus stereothermophilus, C. Staphyllococcus aureus, D. Clostidium tetani
B: Bacillus stereothermophilus
Answer: B: Bacillus stereothermophilus 
Explanation: Bacillus stearothermophilus Plasma sterilization: It is an eg of moist heat sterilization For determining the efficacy of moist heat sterilization, spores of Bacillus stearothermophilus are used as the test organism. The bacterial organism most resistant to the sterilization technique is Bacillus stearothermophilus. Ref: Nathan Ryan & panickers Textbook of Microbiology 9th edition: 32