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Which of the following antibody first reaches the site of infection?

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Which of the following antibody first reaches the site of infection?

(a) IgA

(b) IgE

(c) IgG

(d) IgM

The question was asked in examination.

I'd like to ask this question from Complementary Interactions Between Proteins and Ligands: The Immune System and Immunoglobulins topic in portion Three Dimensional Structure Of Proteins and Protein Function of Biochemistry

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Best answer
Right choice is (d) IgM

Best explanation: IgM which is produced by B cells appears in response to the initial exposure to antigen.

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