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Identical twins develop from:

[A].	An ovum fertilized by two sperms	[B].	An egg developing from parthenogenesis and its blastomeres separating from each other
[C].	Fertilization of two ova simulataneously by two ova simulataneously by two sperms	[D].	A single fertilized egg whose blastomeres separating after 1st cleavage

Answer: Option D