This class of antibodies is made up of five immunoglobulin unit

lgG

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IgM

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IgA

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lgD

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Solution

The correct option is B IgM
Immunoglobulin M or IgM is a basic antibody that is produced by B-cells and is by far the physically largest antibody in the human circulatory system. IgM forms polymers where multiple immunoglobulins are covalently linked together by disulphide bonds, mostly as a pentamer.
So, the correct answer is option B.

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