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Gastrula is a stage in the the development of frog in which embryo possesses:

[A].	Ectoderm, mesoderm and endoderm layers	[B].	Ectoderm layer surrounding the blastocoel
[C].	Ectoderm and endoderm layers forming archenteron	[D].	Ectoderm, mesoderm and endoderm layers alongwith a rudimentary nervous system

Answer: Option A