Primitive gut or archenteron is lined by

Ectoderm

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Mesoderm

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Endoderm

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Trophoectoderm

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Solution

The correct option is C Endoderm
The inner cell mass of the blastocyst after implantation differentiates into an outer ectoderm, middle mesoderm and inner endoderm. The cavity inside the endoderm or the coelom develops into the primitive gut or the archenteron. It is lined by the endoderm cells. So the correct answer is C.

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