**Core Concept**
Human growth hormone (HGH) is a peptide hormone produced by the pituitary gland, playing a crucial role in regulating growth, body composition, cell repair, and metabolism. Its structure is composed of a specific arrangement of amino acids and disulfide bonds, which determine its function and stability.

**Why the Correct Answer is Right**
The human growth hormone has a single polypeptide chain with 191 amino acids, which is stabilized by two intra-chain disulfide bonds. These disulfide bonds are essential for maintaining the hormone's tertiary structure and facilitating its interaction with the growth hormone receptor. The correct arrangement of disulfide bonds allows the hormone to bind effectively to its receptor, triggering a cascade of downstream signaling events that regulate growth and development.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because human growth hormone has two intra-chain disulfide bonds, not one.

**Option C:** This option is incorrect because human growth hormone is composed of a single polypeptide chain, not two separate chains.

**Option D:** This option is incorrect because human growth hormone has two intra-chain disulfide bonds, not two inter-chain disulfide bonds.

**Clinical Pearl / High-Yield Fact**
Human growth hormone deficiency or insufficiency can lead to short stature, delayed puberty, and impaired growth and development. Treatment with recombinant human growth hormone can effectively restore growth and development in affected individuals.

**✓ Correct Answer: B. One polypeptide chain and two intra chaindisulphide bond**