Disorder related with thyroid gland is

Which endocrine gland stores its secretion in the extracellular space before discharging it into the blood

Luteinising hormone $(LH) $ in female

Steroid hormone is derived from

$I.$ Somatostatin inhibits intestinal absorption of glucose       $II.$ Leydig's cell secrete progesterone       $III.$ Melatonin is secreted by pineal gland       $IV.$ Myxoedema is a thyroid disorder       $V.$ Neurohypophysis secreted $ACTH$

Select the correct statements and choose the option

Hormone prolactin was discovered by