This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
Plasma sterilization accuracy is assessed using: 
Select and explain. 
A. Bacillus subtilis, B. Bacillus stereo thermophilus, C. Staphylococcus aureus, D. Clostridium tetani
B: Bacillus stereo thermophilus
Answer: B: Bacillus stereo thermophilus 
Explanation: Ans. is 'b' i.e., Bacillus stereo thermophilusHot air ovenClostridium tetani non-toxigenic strain, B. subtilis subsp nigerAutoclaveB. stearothermophillus, B. subtilis subsp nigerFiltrationBrivundimonas dimunata, SerratiaIonizing radiationB. pumilusEthylene oxideB. GlobigiPlasma sterilizationB. stearothermophillus, B. subtilis subsp niger