Which organism is commonly used to verify the effectiveness of moist heat sterilization methods for sterilizing laboratory equipment and culture media?

Explanation

The effectiveness of moist heat sterilization is typically confirmed by using Bacillus stearothermophilus spores, as they are highly resistant and serve as a biological indicator. Other options like non-pathogenic Clostridium tetani, chemical indicators, or dyes such as methylene blue are not standard for this purpose.