Which Event Occurs with the Sensitizing Dose of Allergen

Multiple Choice

Which event occurs with the sensitizing dose of allergen?

A) degranulation
B) bonding of allergen to adjacent IgE binding sites on mast cells and basophils
C) binding of IgE by the Fc region to mast cells and basophils
D) histamine acting on smooth muscle
E) prostaglandins causing vasodilation and increased vascular permeability