Step 1: What is asked.
We need the hormone that does not contain a peptide chain. A peptide chain is a chain of amino acids.
Step 2: Two main hormone types.
Hormones are mostly either peptide or protein type, made of amino acids, or steroid type, made from cholesterol.
Step 3: Sort the options.
Oxytocin, corticotropin, and insulin are all built from amino acid chains. So they are peptide or protein hormones.
Step 4: The odd one.
Cortisone is made from cholesterol, so it is a steroid hormone. Steroids do not have a peptide chain.
Step 5: Confirm.
Since cortisone has no amino acid backbone, it is the hormone without a peptide chain.
Step 6: Conclusion.
So the answer is cortisone.
Answer: Cortisone