Question

What is the primary characteristic of allergens?

Options

• They are usually foreign proteins

• They are toxic substances present in food

• They are always domestic in origin

• They are always produced by the body

Answer 1

Allergens are usually foreign proteins that originate from environmental sources. This foreign nature triggers the immune system to recognize them as threats and mount an exaggerated response. Understanding that allergens are typically proteins helps explain why substances like pollen, animal dander, and dust mite feces are such potent triggers for allergic reactions.