**Core Concept**
The **striated vertebra** is a radiological finding associated with a specific condition. It is characterized by a striated or striped appearance of the vertebrae on imaging. This phenomenon is related to the **bone marrow** and its interaction with the vertebrae.

**Why the Correct Answer is Right**
The correct answer is related to conditions affecting bone marrow. In **sickle cell disease**, the bone marrow expands to compensate for the lack of functional red blood cells, leading to changes in the bone structure, including the striated appearance of vertebrae. This is due to the **marrow hyperplasia** and **bone remodeling** that occur in response to the chronic anemia.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not directly related to the bone marrow expansion or the characteristic striated appearance of vertebrae.
**Option B:** Incorrect as it does not typically cause the specific radiological finding of striated vertebrae.
**Option C:** Incorrect because, although it involves the bone, it does not characteristically produce a striated pattern in the vertebrae.

**Clinical Pearl / High-Yield Fact**
The striated vertebra is a key finding in conditions with **bone marrow hyperplasia**, such as sickle cell disease. Recognizing this pattern can aid in the diagnosis of such conditions.

**Correct Answer:** D. Sickle cell disease