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An allergen is a(n)

A.

Interferon

B.

Macrophage

C.

Antigen

D.

Antibody

Answer and Explanation

The Correct Answer is C

A. Interferon is a type of protein produced by the body in response to infections, particularly viral infections. It is not related to allergens.
B. Macrophage is a type of white blood cell that engulfs and digests pathogens, dead cells, and other debris. It is not an allergen.
C. An allergen is a substance that triggers an allergic reaction. It is considered a type of antigen—a foreign substance that the immune system recognizes and reacts to, often causing symptoms like inflammation, swelling, or itching in allergic individuals.
D. Antibody is a protein produced by B cells that binds to specific antigens, but it is not an allergen.


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Related Questions

Correct Answer is C

Explanation

A. Plasma refers to the liquid component of blood, not tissue fluid.
B. Chyle is a specific type of lymph that is rich in fats, typically absorbed from the intestines, and not the general fluid that enters the lymphatic vessels.
C. Lymph is the correct answer. It is the fluid that forms when tissue fluid enters the lymphatic vessels. Lymph is derived from interstitial fluid and contains water, proteins, waste products, and immune cells.
D. Serum is the liquid portion of blood without clotting factors, but it is not related to the lymphatic system.

Correct Answer is A

Explanation

A. Chyle drainage is not a function of the spleen. Chyle, a milky fluid rich in fats absorbed from the intestines, is transported by the lymphatic system — specifically through structures like lacteals and the thoracic duct — not the spleen.
B. Blood filtration is a key function of the spleen, as it removes pathogens and debris from the blood.
C. Destruction of old red blood cells occurs in the spleen, which acts as a graveyard for aging or damaged red blood cells.
D. Blood storage is also a spleen function; it can store blood and release it in case of hemorrhage or increased demand.

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