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Innate Immunity

Assertion: Ig...

Question

Assertion: IgM is a type of immunoglobulin which cannot cross the placenta.

Reason: IgM is pentamer immunoglobulin, joined by J-chain.

A

Both assertion and reason are true and reason is the correct explanation of assertion

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B

Both assertion and reason are true but reason is not the correct explanation of assertion

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C

Assertion is true but reason is false

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D

Both assertion and reason are false

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Solution

The correct option is A Both assertion and reason are true and reason is the correct explanation of assertion
IgM is pentamer immunoglobulin, joined by J-chain which is also the largest immunoglobulin. IgM cannot cross the placenta from the mother to the foetus. The immunoglobulin which can pass through placenta is IgG which is the smallest immunoglobulin.

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