Which one of the following hormones contains peptide chain?

Hormones are chemically classified into steroids, amino acid derivatives, and peptides. Peptide hormones consist of polypeptide chains of amino acids [1]. Insulin is a well-known peptide hormone produced by the pancreas; it consists of 51 amino acids arranged in two disulfide-linked polypeptide chains [1]. While Oxytocin and Corticotropin (ACTH) are also peptide hormones—oxytocin being a nonapeptide and Corticotropin being a 39-amino acid peptide—Insulin is the most classic example of a hormone containing multiple peptide chains [1]. In contrast, Cortisone is a steroid hormone derived from cholesterol and does not contain a peptide chain. Although options 1, 2, and 3 are all technically peptide-based, Insulin is the standard biological reference for a hormone composed of distinct polypeptide chains in most competitive examinations.

Sources

1. [1] https://www.ncbi.nlm.nih.gov/books/NBK541112/
2. [2] Science , class X (NCERT 2025 ed.) > Chapter 6: Control and Coordination > Do You Know? > p. 111