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Find out the wrong statement :...

Find out the wrong statement `:`

A

In mammals, allantois is not excretory in function

B

Amnionis the outer layer containing amniotic fluid that acts as shock absorber to the soft embryo

C

Yolk sac is a fetal membrane that helps in the nourishment of the embryo in general.

D

Chorio-allantoic membrane develops villi and contributes much to the development of placenta

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