**Core Concept**
Skeletal abnormalities in metabolic disorders can lead to characteristic radiographic findings. Beaded ribs with epiphysial swelling are indicative of a specific condition that affects bone growth and development.

**Why the Correct Answer is Right**
This radiographic feature is characteristic of **Scurvy**, caused by a deficiency in vitamin C (ascorbic acid). Vitamin C is crucial for the synthesis of collagen, a protein that provides structural support to bones and cartilage. In scurvy, the lack of vitamin C impairs collagen synthesis, leading to defective bone growth and development, resulting in beaded ribs and epiphysial swelling.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the description of beaded ribs with epiphysial swelling.
**Option B:** This is incorrect as it is not related to the characteristic radiographic feature of scurvy.
**Option C:** This option does not match the description of beaded ribs with epiphysial swelling.

**Clinical Pearl / High-Yield Fact**
Scurvy is a classic example of a metabolic disorder that affects bone growth and development, and its radiographic features can be distinctive and diagnostic.

**Correct Answer: D. Scurvy**