Symptoms of an allergic reaction are based on the release of ________
A) an antigen
B) an antibody
C) anaphylaxis
D) histamine
Answer: D
A) An antigen is a foreign substance; it is not released.
B) An antibody is released by the immune system in response to an antigen, but it does not cause an allergic reaction itself.
C) Anaphylaxis is a severe allergic reaction, but it is not released.
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Fill in the blank(s) with correct word