**Core Concept**
The nucleus pulposus is a critical component of the intervertebral disc, playing a key role in shock absorption and spinal flexibility. It is composed of a gelatinous matrix of proteoglycans and collagen, which provides its characteristic viscoelastic properties.

**Why the Correct Answer is Right**
The nucleus pulposus is derived from the notochord, a precursor to the spinal cord that is present in the embryonic development of vertebrates. As the notochord matures, it gives rise to the nucleus pulposus, which then becomes embedded within the intervertebral disc. This embryonic origin is essential for understanding the pathophysiology of disc degeneration and its potential impact on spinal health.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the annulus fibrosus, not the nucleus pulposus, is derived from the somites, which are mesodermal structures that give rise to skeletal muscles, bones, and connective tissue.
**Option B:** This option is incorrect because the vertebral bodies, not the nucleus pulposus, are derived from the sclerotome, which is a subdivision of the somites that contributes to the development of the axial skeleton.
**Option C:** This option is incorrect because the spinal cord, not the nucleus pulposus, is derived from the neural tube, which is a tube-like structure that gives rise to the central nervous system during embryonic development.

**Clinical Pearl / High-Yield Fact**
Remember that the notochord plays a critical role in the embryonic development of the vertebral column, and its remnants can be found in the nucleus pulposus throughout life. This knowledge can be useful in understanding the pathophysiology of disc degeneration and the potential impact on spinal health.

**Correct Answer: C. The notochord.**