Which decontamination method results in destruction of all microbial life?

• A. Disinfection
• B. Sanitization
• C. Purification
• D. Sterilization

Answer: (D)

Destruction of all microbial life defines sterilization. Among decontamination methods, sterilization is the only one that guarantees no viable organisms remain, including heat‑resistant spores. Disinfection and sanitization reduce microbial load or kill most pathogens but do not ensure complete sterility. Purification isn’t a standard term for killing microbes; it generally refers to removing contaminants rather than guaranteeing that all microorganisms are destroyed. Sterilization uses validated processes—such as steam under pressure, dry heat, certain chemicals, or irradiation—that achieve complete microbial destruction, which is why it’s the correct choice when total sterility is required.