Question

what is a type of contaminant that can cause foodborne illness?
chemical preservatives
organic ingredients
cholesterol
parasites

Explanation:

Parasites are living organisms that can contaminate food. When ingested, they can cause foodborne illnesses. Cholesterol is a lipid found in the body and some foods; it's not a contaminant that causes illness. Organic ingredients are natural components of food. Chemical preservatives are added to food to prevent spoilage but are not contaminants that cause illness in the context of being a pathogen - like contaminant.

Answer:

parasites