<prompt> The biological indicator used in various autoclave machines for quality check is-Clostridium tetaniBacillus stereothermophilusBacillus pumilusBacillus subtilis  <response>: METHOD Sterlization control Hot air oven Autoclave Filtration Ionizing radiation cold sterilization Ethylene oxide Plasma sterilization Clostridium tetani non toxigenic strain, B.subtilis sub sp. niger B.Stearothermophillus Brivundimonas dimunata B. Pumilus B.Globigi B.Stearothermophillus 