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Question

Placenta is formed in humans by

A
Amnion
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B
Allantois
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C
Chorion
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D
All the above
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Solution

The correct option is C Chorion
Human placenta is composed of both maternal tissue and tissue derived from the embryo. However, it is largely formed by chorion. Chorion is the embryonic-derived portion of the placenta. It contains blood vessels formed by allantois and trophoblasts which are organized into chorionic villi.
Thus, the correct answer is 'Chorion.'

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