Microbiology Which of the following is used to test the efficiency of sterilization in an autoclave? A Clostridium tetani B Bacillus stearothermophilus C Bacillus pumilus D Bacillus cereus 💡 Explanation Which of the following is used to test the efficiency of sterilization in an autoclave? ✓ Correct Answer: B. Bacillus stearothermophilus