Microbiology General ba6cae91 Biological indicator for Autoclave is A CL tetani B Bacillus subtilis C Bacillus pumilis D Geo bacillus stearothermophilus High-Yield Explanation Autoclave - Geobacillus stearothermophilus Hot air oven - CL tetani or bacillus subtilis Ionizing radiation - Bacillus pumilus.