Which of the following is NOT considered a biological hazard?

Cleaning solutions are not considered a biological hazard because they are chemical substances used for sanitizing and disinfecting surfaces in food preparation areas. Biological hazards specifically refer to microorganisms such as bacteria, viruses, and parasites that can cause foodborne illnesses. Bacteria and viruses are living pathogens that can multiply in food, while parasites are organisms that live on or in a host and can also contaminate food. Therefore, since cleaning solutions do not fall into the category of living organisms that can result in illness but rather serve to eliminate contaminants, they are classified as chemical hazards instead.