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Which of the following structures are formed by the ectoderm in frog:

[A].	Epidermis, stomodaeum and proctodaeum	[B].	Retina, lens, cornea and conjunctiva of the eye
[C].	Olfactory lobes, autitory vesicle, pituitary, pineal body and adrenal medulla	[D].	All of these

Answer: Option D