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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 A

Explanation

A. GALT stands for Gut-Associated Lymphoid Tissue, which refers to lymphoid tissue found in the gastrointestinal tract, including structures like Peyer's patches and the appendix, that play a role in immune defense.
B. Lacteals are specialized lymphatic capillaries found in the small intestine, responsible for absorbing digested fats, not lymphoid tissue.
C. Kupffer cells are macrophages located in the liver, responsible for filtering the blood, not in the gastrointestinal tract.
D. MALT stands for Mucosa-Associated Lymphoid Tissue, which refers to lymphoid tissue found in mucosal membranes throughout the body, including the gastrointestinal tract, but GALT is the specific term for lymphoid tissue in the gut.

Correct Answer is C

Explanation

The right lymphatic duct drains lymph from the right side of the head, neck, right arm, and right side of the chest, including the right breast (right mammary vessels).

A. Right Tibial vessels drain lymph from the lower legs, which eventually drains into the thoracic duct, not the right lymphatic duct.
B. Right iliac vessels drain lymph from the pelvic region and also empty into the thoracic duct, not the right lymphatic duct.
D. Right femoral vessels drain lymph from the lower limbs, and their lymph also eventually drains into the thoracic duct.

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