Which of the following is NOT a type of disinfectant?

The choice of "synthetic level" is not recognized as a standard category of disinfectants. Disinfectants are typically categorized into high, medium, and low-level based on their efficacy and the types of pathogens they can kill.

High-level disinfectants are effective against all microorganisms except large numbers of bacterial spores, making them suitable for use on critical items that cannot be sterilized. Medium-level disinfectants can kill most bacteria, many viruses, and some fungi, making them appropriate for non-critical items that may come into contact with mucous membranes. Low-level disinfectants can kill some bacteria and viruses but are not effective against spores and mycobacteria, typically used for non-critical surfaces.

In contrast, "synthetic level" does not refer to a recognized category of disinfectants within established safety and sanitation guidelines, making it the odd term out among the options provided. It is essential to understand the classifications of disinfectants for effective infection control and sanitation practices.