All of the following are true of hypersensitivity EXCEPT
A) it requires previous exposure to an antigen.
B) it is synonymous with "allergy."
C) it occurs when an individual is exposed to an allergen for the first time.
D) it is due to an altered immune response.
E) it occurs in the presence of an antigen.

The chemical mediators of anaphylaxis are
A) antigen-antibody complexes.
B) found in basophils and mast cells.
C) the proteins of the complement system.
D) antibodies.
E) antigens.

Which of the following may result from systemic anaphylaxis?
A) hives
B) asthma
C) hay fever
D) shock
E) immunodeficiency