Question: 151. Which of the following is not a steroid hormone?
(1) Cortisol
(2) Testosterone
(3) Progesterone
(4) Glucagon
Answer: Option (4)
Explanation:
Steroid hormones are derived from cholesterol and are lipid-soluble in nature.
Cortisol, testosterone, and progesterone are all synthesized from cholesterol and belong to the group of steroid hormones.
Glucagon is a peptide hormone composed of amino acids and is secreted by the alpha cells of the pancreas.
Since glucagon is not derived from cholesterol and is proteinaceous in nature, it is not a steroid hormone.
Therefore, the correct answer is glucagon, which corresponds to option (4).