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
Indicator for sterilization by autoclave - 
Select and explain. 
A. Bacillus subtilis, B. Bacillus stereothermophilus, C. Staphylococcus aureus, D. Clostrtidium tetani
B: Bacillus stereothermophilus
Answer: B: Bacillus stereothermophilus 
Explanation: Ans. is 'b' i.e., Bacillus stereothermophilus Type of SterilizationSpore usedMoist heat (autoclave)Bacillus stearothermophilusDry heat (hot air oven)Bacillius subtilisIonizing radiationBacillus pumilisGas sterilization (ethylene oxide)Bacillus subtilisPlasma sterilizationBacillus stearothemophilus