<prompt> Bacterial indicator for dry heat sterilization is ?Bacillus subtilisBacillus pumilisBacillus stearothermophilusCoxiella burnetti  <response>: sterilization control Biological; the spore of a nontoxigenic strain of Clostridium tetani Bacillus subtilus subsp.niger are used microbiological test of dry heat efficacy REF:Ananthanarayan Panickers Textbook of Microbiology 9th edition pg no:30 