**Core Concept**
Rickets is a disorder caused by a lack of vitamin D, calcium, or phosphate. It leads to softening and weakening of the bones in children, resulting in skeletal deformities and abnormalities. The radiological features of rickets are crucial for diagnosis and include characteristic changes in the bones.

**Why the Correct Answer is Right**
The correct answer is not a radiological feature of rickets. Rickets is characterized by a variety of radiological features, including:
- **Trabecular thinning and fraying**: This is a hallmark feature of rickets, where the trabeculae in the metaphysis of long bones become thin and irregular.
- **Looser zones**: Also known as pseudofractures, these are radiolucent lines that can be seen in the bones of children with rickets.
- **Metaphyseal cupping**: This refers to the concave deformity of the metaphysis of long bones, which is a characteristic feature of rickets.
- **Rachitic rosary**: This term refers to the bony knobs that can be seen on the costochondral junctions of children with rickets.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is actually a characteristic feature of rickets. **Trabecular thinning and fraying** are a hallmark of the disease.
**Option B:** This option is incorrect because **Looser zones** are a well-documented feature of rickets. They are radiolucent lines that can be seen in the bones of children with rickets.
**Option C:** This option is incorrect because **Metaphyseal cupping** is a characteristic feature of rickets, where the metaphysis of long bones becomes concave.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that rickets is often caused by a combination of factors, including a lack of vitamin D, calcium, or phosphate. This can be due to inadequate dietary intake, impaired absorption, or increased excretion of these nutrients.

**Correct Answer: D.**