Question

which gland controls the functioning of the endocrine system?
parathyroid gland
thyroid gland
pituitary gland
adrenal gland

Explanation:

The pituitary gland is known as the "master gland" as it secretes hormones that regulate other endocrine glands. Parathyroid regulates calcium, thyroid regulates metabolism, adrenal deals with stress; none control the entire endocrine system like the pituitary.

Answer:

C. Pituitary gland