उत्तर : 3. "Reproductive glands"
व्याख्या :

Answer: C) Reproductive glands Explanation: Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct.   The major glands of the endocrine system include: pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.