**Core Concept**
The development of somites is a crucial aspect of embryology, particularly in the formation of the musculoskeletal system. Somites are precursor structures that give rise to various tissues, including skeletal muscle, vertebrae, and dermis. They are formed from the **paraxial mesoderm**.

**Why the Correct Answer is Right**
Somites develop from the **paraxial mesoderm**, which is one of the three primary divisions of the mesoderm (the others being intermediate and lateral plate mesoderm). The paraxial mesoderm segments into blocks of tissue called somites, which then differentiate into **sclerotomes** (forming vertebrae), **myotomes** (forming skeletal muscle), and **dermatomes** (forming dermis).

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not specify the correct embryological origin.
**Option B:** Incorrect as it is not directly related to somite formation.
**Option C:** Incorrect because, although mesoderm is involved, it is too broad and does not specify the paraxial portion.

**Clinical Pearl / High-Yield Fact**
Remembering that somites give rise to skeletal muscle, vertebrae, and dermis is crucial for understanding various congenital anomalies and syndromes related to musculoskeletal development.

**Correct Answer:** D. Paraxial mesoderm.