Which of the following endocrine glands operate independently of pituitary gland regulation?

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Thyroid gland, testes, and adrenal medullaAdrenal medulla, parathyroid glands, and pancreatic isletsAdrenal cortex, parathyroid glands, and ovariesPancreas, adrenal medulla, and thyroid glandNone of the above

Explanation

The adrenal medulla, parathyroid glands, and pancreatic islets function without direct control from the pituitary gland, unlike other endocrine glands such as the thyroid, adrenal cortex, and gonads which are regulated by pituitary hormones.