Biological indicator for Autoclave is: (A) CL tetani, (B) Bacillus subtilis, (C) Bacillus pumilis, (D) Geo bacillus stearothermophilus
Answer is D. Autoclave  - Geobacillus stearothermophilus
Hot air oven - CL tetani or bacillus subtilis
Ionizing radiation - Bacillus pumilus.