The pituitary gland is a small, pea-sized gland located at the base of the brain, in a bony hollow called the sella turcica, which is in the head. It is often called the "master gland" because it produces hormones that control many other endocrine glands in the body, including the thyroid and adrenal glands.

A. parathyroid glands are located in the neck, typically on the back surface of the thyroid gland.

B. thyroid gland is located in the front of the neck, below the voice box.

D. adrenal glands are located on top of each kidney, which are in the abdomen

The correct answer is option C