Question

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

Explanation:

Parasites can live in or on food and when ingested can cause food - borne illness. Chemical preservatives in proper amounts are generally safe, organic ingredients are not contaminants, and cholesterol is a normal component of some foods and not a typical food - borne illness - causing contaminant.

Answer:

parasites