Insulin consists of three short polypetide chians i.e., chains A, chain B and Chain C.

Answer

**Step-by-Step Solution:**

1. **Understanding Insulin Structure**: Insulin is a peptide hormone that plays a crucial role in glucose metabolism. It is composed of polypeptide chains.

2. **Identifying the Chains**: The statement mentions three chains: A, B, and C. However, it is important to clarify that insulin is primarily composed of two chains (A and B) in its mature form.

3. **Proinsulin Form**: In its precursor form, known as proinsulin, insulin does indeed consist of three chains: A, B, and C. The C chain is a connecting peptide that is removed during the maturation process.

4. **Maturation Process**: During the conversion from proinsulin to insulin, the C peptide is cleaved off, resulting in the active form of insulin, which consists only of the A and B chains.

5. **Final Structure of Insulin**: The mature insulin molecule consists of two chains (A and B) that are linked together by disulfide bonds. The C peptide is not present in the final active form of insulin.

6. **Conclusion**: Therefore, the statement that "Insulin consists of three short polypeptide chains i.e., chains A, B, and C" is incorrect. The correct information is that insulin, in its mature form, consists of only two chains (A and B), while the C chain is part of the inactive proinsulin form.

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