Final answer:
IgE-mediated allergic reactions involve an immediate response followed by delayed hypersensitivity, which is a secondary, cell-mediated immune response. Allergy to pollen is an example of immediate hypersensitivity.
Step-by-step explanation:
IgE-mediated allergic reactions consist of an immediate response followed by a delayed hypersensitivity. This type of response is associated with a secondary immune response that occurs after re-exposure to an antigen, leading to cell-mediated immunity involving cytokine-mediated inflammatory responses. This process can result in symptoms such as a rash or skin irritation and is the underlying mechanism for certain types of allergies, including contact with jewelry or cosmetics and response to poison ivy. The appropriate answer to the question is C) Delayed hypersensitivity.
Allergy to pollen is classified as d. immediate hypersensitivity. This is a type I hypersensitivity reaction where exposure to an allergen such as pollen triggers an antibody-mediated immune response, involving IgE antibodies, that occurs within minutes. The body reacts by releasing histamine and other chemical mediators from mast cells, leading to allergic symptoms.