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[A] : Placenta is a tissue in eutherian ...

[A] : Placenta is a tissue in eutherian mam- mals that has both embryonic and maternal tissue.
[R]: In mammals, foetal components of the placenta derive from trophoblast.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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Assertion : In placental mammals the placenta is connected to the embryo by the umblical cord and has an essential role in the immunological protection of the embryo . Reason : In mammals foetal components of the placenta derive initially from the chondroblast connected with embryonic blood stream either through its contact with the yolk sac.

Embryonic connective tissue is derived from

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