A patient who undergoes a high level of mast cell degranulation,dilation of blood vessels,and acute drop in blood pressure is likely suffering from

A)an autoimmune disease.
B)a typical allergy that can be treated by antihistamines.
C)an organ transplant, such as a skin graft.
D)the effect of exhaustion on the immune system.
E)anaphylactic shock immediately following exposure to an allergen.