Microbiology Spores of which of the following are used as a control in an autoclave A Clostridium tetani B Bacillus stearothermophilus C Bacillus pumilus D Bacillus subtilis var niger 💡 Explanation Spores of which of the following are used as a control in an autoclave ✓ Correct Answer: B. Bacillus stearothermophilus