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(D) The embryonic origin of various endocrine glands and structures is as follows:$1$. The pituitary gland (hypophysis) is derived from the ectoderm (

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(D) The embryonic origin of various endocrine glands and structures is as follows:$1$. The pituitary gland (hypophysis) is derived from the ectoderm (specifically,the adenohypophysis from Rathke's pouch and the neurohypophysis from the floor of the diencephalon).$2$. The pineal gland is also derived from the ectoderm (specifically,the neuroectoderm of the diencephalon).$3$. The lens of the eye is formed from the surface ectoderm.Therefore,all the given structures are ectodermal in origin.

Column $I$	Column $II$
$i$. Alzheimer's disease	$a$. Oversecretion of Growth Hormone from pituitary gland in adults.
$ii$. Diabetes mellitus	$b$. Degeneration of dopamine-producing neurons in $CNS$.
$iii$. Acromegaly	$c$. Underactivity of Beta cells of pancreas.
$iv$. Parkinson's disease	$d$. Degeneration of cholinergic and other neurons in $CNS$.

From the perspective of embryonic origin,which of the following is ectodermal?

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