Assertion :The immunoglobulin, which cannot pass through placenta and such foetus is IgM. Reason: IgM is a pentamer immunoglobuline joined by J-chain.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
IgM is a pentamer in which the individual IgM molecules are linked by disulphide bonds and a J-chain. It consists of two heavy and two light chain. It cannot pass through the placenta due to this pentamer structure. So, the correct option is A.

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