This hormone, ____________, is the main mineralocorticoid hormone. It is a steroid hormone produced by the adrenal gland. It plays a central role in the regulation of blood sodium and postassium levels, thereby impacting the body's hydration level, as well as its blood volume and pressure. In fact, some blood pressure medications are effective because they interfere with the secretion or action of this hormone. What hormone is it?
a. cortisol
b. hydrocortisone
c. parathyroid hormone
d. aldosterone