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
Which organism acts as the control of autoclave? 
Select and explain. 
A. Mycobacterium, B. Bacillus stearothermophilus, C. Coryne bacterium, D. Clostridium perfringens
B: Bacillus stearothermophilus
Answer: B: Bacillus stearothermophilus 
Explanation: Ans: b (Bacillus stearothermophilus) Ref: Ananthanarayan, 7th ed,p. 78Autoclaving: (Moist heat) (121degC X 15 min under 15 lb/sq.inch pressure) - dressings, gloves, glass syringes, culture media, suture materials except catgut.Sterilizing control is by bacillus stearo thermophilus.Hot air oven: (Dry heat) (160degCX 1 hr)-glasswares, glass syringes, oil, grease, liquid paraffin, dusting powder. Sterilization control is by spores of non toxigenic strains of Clostridium tetani.