Insulin is secreted by

Which of the following gland plays a key role in metamorphosis of frog’s tadpole

Which of the following is master gland of our body

Steroid hormone is derived from

Which of the following given organs are influenced by activity of $PTH$?

The option containing all correct answers is

$I$. Kidney    $II.$ Bone   $III$. Muscle    $IV$. Intestine    $V$. Brain

Hormone prolactin was discovered by