Answer:
a. endocrine
Explanation:
Endocrine glands are the glands of endocrine system which secrete their products which are hormones into interstitial fluid which is surrounded by secretory cells from where they got diffused into the capillaries which are further carried away by the blood rather than using a specific duct. Major glands of endocrine system include pituitary gland, hypothalamus , pineal gland, ovaries, , thyroid gland, pancreas, testes, parathyroid gland and adrenal glands. Hypothalamus and the pituitary gland are known as neuroendocrine organs.
