VMC-0051
QUESTION
Which of the following is known as secretory antibody?
OPTIONS
(A) IgA
(B) IgG
(C) IgE
(D) IgM
ANSWER
(A) IgA
EXPLANATION
IgA is the major immunoglobulin associated with mucosal and secretory immunity and is present in secretions such as saliva, tears, respiratory secretions, and intestinal fluid. Therefore option A is correct; IgG is the principal serum Ig, IgE is associated with allergy and helminth immunity, and IgM is the principal antibody of the early primary response.
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