True coelom is a space between the body wall and alimentary canal. It is lined by

Mesoderm on one side and ectoderm on the other side.

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Endoderm on one side and ectoderm on the other side.

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Mesoderm on both the sides.

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Ectoderm on both the sides.

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Solution

The correct option is C Mesoderm on both the sides.
Coelom refers to the main body cavity and the body cavity is any fluid-filled space in a multicellular organism.
It is the space where internal organs develop. The organisms can have true coelom (known as Eucoelomates) or false coelom (known as Pseudocoelomates).
Eucoelomates have a fluid-filled body cavity that is formed within the mesoderm layer and thus, lined with the mesoderm layer from both sides.

Thus, the correct answer is option C.

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