Question

which can be a cause of food - borne illness?
pathogens
physical objects
allergens
chemicals
all of the above

Explanation:

Food - borne illness can be caused by various factors. Pathogens (such as bacteria, viruses, and parasites) can contaminate food and cause illness. Physical objects (like glass or metal fragments in food) can cause physical harm. Allergens (substances that cause allergic reactions) can lead to adverse health effects when ingested. Chemicals (such as pesticides or heavy metals) can also contaminate food and cause illness. So, all of these can be causes of food - borne illness.

Answer:

All of the above