41. Which of the following statements concerning endocrine system in mammals is correct? (A) Pituitary hormones are involved in the inhibition of downstream endocrine organs such as thyroid gland. (B) Positive feed-back control is the most commonly seen mode of regulation in theendocrine physiology. (C) Adrenal gland is divided to cortex and medulla which can be distinguished by the hormones they secrete. (D) Thyroidal hormones (T4 and T3) are involved in regulation of blood pressure.