Thyrotropin-Releasing Factor $(TRF)$ is produced by

Somatostatin is secreted by

The hypothalamus contains several groups of neurosecretory cells called:

The pituitary gland is under the control of

Select the correct option on the basis of the following sentences:
$(I)$ Hypothalamus is the basal part of diencephalon.
$(II)$ It regulates a wide spectrum of body functions.
$(III)$ Two types of hormones are produced by the hypothalamus.
$(IV)$ Gonadotropins are hypothalamic hormones.

Where are the hormones of the neurohypophysis synthesized?