Which one of the following hormones contains peptide chain?

Which one of the following hormones contains peptide chain?

Oxytocin
Corticotropin
Insulin
Cortisone
This question was previously asked in
UPSC CDS-1 – 2016
Insulin is a hormone that contains peptide chains.
– Hormones can be classified based on their chemical structure, including peptide/protein hormones, steroid hormones, and amino acid derivatives.
– Oxytocin is a peptide hormone (specifically, a nonapeptide).
– Corticotropin (ACTH) is a peptide hormone (a polypeptide of 39 amino acids).
– Insulin is a protein hormone composed of two polypeptide chains linked by disulfide bonds.
– Cortisone is a steroid hormone, derived from cholesterol.
While Oxytocin and Corticotropin are also peptide hormones, Insulin is a very prominent example of a protein hormone with peptide chains and is often used as a representative example in biochemistry. Given that the question asks for “Which *one* of the following”, and options A, B, and C are all peptide/protein hormones while D is a steroid, it suggests the question intends to identify one among the choices that fits the description, distinguishing it from non-peptide types. All A, B, C fit, making the question potentially flawed if only one answer is strictly correct. However, in such a context, selecting a well-known example of a larger protein hormone like Insulin is a common pattern.
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