Hay Fever That Occurs When People Are Exposed to Pollen

Hay fever that occurs when people are exposed to pollen involves an excess release of IgE, which binds to _______ and causes them to_______ .

A) pollen : stimulate the release of histamine
B) T helper cells : stimulate the proliferation of cytotoxic T cells
C) mast cells : stimulate the proliferation of cytotoxic T cells
D) macrophages : destroy the pollen whose by -products stimulate histamine release
E) mast cells : degranulate, releasing histamine