The extra embryonic membrane that involve in the formation of the placenta in human is

Chorion

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Allantois

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Yolk sac

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Amnion

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Solution

The correct option is A Chorion
In humans and other mammals (excluding monotremes), the chorion is one of the fetal membranes that exist during pregnancy between the developing fetus and mother. The chorion and the amnion together form the amniotic sac.
So, the correct option is A. (Chorion)

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