Which of the following is an example of a high-level disinfectant?

Hydrogen peroxide is a high-level disinfectant due to its effective antimicrobial properties, especially against bacteria, viruses, and fungi. It works by producing reactive oxygen species that can destroy cellular components, leading to the death of the microorganisms. High-level disinfectants are used to disinfect items that come into contact with mucous membranes or sterile areas of the body, as they can achieve a significant reduction in microbial load.

When considering other options, alcohol is often classified as an intermediate-level disinfectant, as it is effective against many bacteria and some viruses but may not be reliable against all spores or certain types of viruses. Soap and water do not qualify as a disinfectant; instead, they are used for sanitization by removing dirt and microbes but do not kill them. Bleach, while a strong disinfectant and effective against many pathogens, is typically considered a high-level disinfectant when used at the appropriate concentrations. However, due to the specific classification and properties of hydrogen peroxide, it stands out in this context as a high-level disinfectant suitable for critical items requiring thorough disinfection.