A Reaction to an Allergen is a ________ Hypersensitivity

Question

A reaction to an allergen is a ________ hypersensitivity.
A) type I
B) type II
C) type III
D) type IV
E) type V

Accepted Answer

A reaction to an allergen is a type I hypersensitivity, which involves an exaggerated immune response mediated by IgE antibodies leading to the release of histamine and other mediators causing inflammation and symptoms such as itching, swelling, and breathing problems. Type II hypersensitivity involves antibody-mediated cell destruction, type III involves immune complex deposition, and type IV involves delayed-type cell-mediated hypersensitivity. Type V hypersensitivity is not a recognized category of hypersensitivity reactions.