__ are most resistant microorganisms to disinfection A. Enveloped viruses B. Prions C. HIV D. Helminths

The correct answer is B. Prions.<br /><br />Prions are misfolded proteins that can cause a variety of neurodegenerative diseases. They are highly resistant to disinfection methods, including heat, radiation, and chemical disinfectants. This resistance is due to their unique structure and the fact that they do not contain nucleic acids, which are typically targeted by disinfectants.<br /><br />Enveloped viruses (A) are generally more susceptible to disinfection because they have lipid envelopes that can be disrupted by disinfectants. HIV (C) is an enveloped virus and thus also more susceptible to disinfection. Helminths (D), which are parasitic worms, are generally not as resistant to disinfection as prions.<br /><br />Therefore, prions are the most resistant microorganisms to disinfection among the options provided.