Which chemical hazard is known to contaminate food?

The correct answer identifies pesticides as a chemical hazard that can contaminate food. Pesticides are substances used to prevent, destroy, or control pests in agriculture, and when used on crops, they can leave residues that may pose a risk to human health if ingested. Proper handling and application of pesticides are crucial to minimize any potential contamination of food products.

In contrast, the other options refer to different types of hazards. Viruses and bacteria are biological hazards, which are living organisms that can cause foodborne illnesses, not chemical contaminants. Cleaners, while important in maintaining hygiene and safety in food preparation areas, are considered chemical hazards in the context of use and storage but not typically in relation to food production itself. However, unlike pesticides, cleaners are not directly intended for application on food. Thus, while all options highlight important considerations for food safety, pesticides specifically represent a direct chemical hazard in the context of food contamination.