Question

Which of the following is a hormone?

• A. Vitamin D
• B. Thyroxine
• C. Adrenaline
• D. All of the above

Answer 1

Answer: (D)

All of the above

Vitamin D is a hormone produced by the kidneys that help to control the concentration of calcium in the blood and is vital for the development of strong bones. Thyroxine, also called as 3,5,3,5-tetraiodothyronine, or $T_4$, is one of the two major hormones secreted by the thyroid gland. Epinephrine, more commonly known as adrenaline, is a hormone secreted by the medulla of the adrenal glands.