The correct answer is: $ Option B: Insulin Explanation: Polypeptide hormones are made up of chains of amino acids. Insulin is a classic example - it's composed of two peptide chains (A and B chains) linked by disulfide bonds. Epinephrine is a catecholamine (derived from the amino acid tyrosine). Estrogen and androgen are steroid hormones derived from cholesterol. Hence, Insulin is the polypeptide hormone among the options.