Question

Both hypersensitivity and auto-immune diseases cause some sort of redness or swelling, due to the elevated immune response. But the main difference between them is:

• A. Allergies are more severe
• B. Allergies do not involve the immune system
• C. Allergies are when the immune system attacks the host's own body
• D. Allergies are reactions to a foreign substance

Answer 1

The correct option is D Allergies are reactions to a foreign substance

Both, auto-immune disease and allergy, can have similar symptoms but they are very different in nature.

An allergy is a hypersensitive reaction of the host immune system to a foreign substance. Whereas, auto-immune disease is a disease where the immune system of the host attacks its own cells.