Foetal membranes produced by trophoblast are

Chorion and allantois

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Chorion and amnion

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Amnion and allantois

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Allantois and yolk sac

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Solution

The correct option is B Chorion and amnion
The blastocyst at 32-celled stage develops into an outer trophoblast layer and an inner cell mass. The trophoblast divides into the foetal membranes chorion and amnion. They together form the amniotic sac. It is formed by extraembryonic mesoderm and the two layers of trophoblast that surround the embryo and other membranes.

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