## **Core Concept**
The question presents a clinical scenario involving a woman with headaches and visual disturbances, specifically heteronymous hemianopia, alongside suprasellar calcifications on lateral X-ray. This combination of symptoms and radiological findings points towards a diagnosis affecting the suprasellar region, likely involving the optic chiasm.

## **Why the Correct Answer is Right**
The correct answer, **Craniopharyngioma**, is a type of brain tumor that occurs in the suprasellar region, near the optic chiasm and hypothalamus. It is known for causing visual disturbances, including hemianopia, due to its proximity to the optic chiasm. The presence of calcifications within the tumor is a characteristic feature, often visible on imaging studies like X-rays or CT scans. Craniopharyngiomas can also cause headaches due to their mass effect.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Not provided, assuming it's an incorrect diagnosis.
- **Option B:** Not provided, assuming it's an incorrect diagnosis.
- **Option D:** Not provided, assuming it's an incorrect diagnosis.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that craniopharyngiomas are often associated with **suprasellar calcifications** and can cause **visual field defects** like hemianopia due to their location near the optic chiasm. They are also known to cause **endocrine disturbances** due to their proximity to the hypothalamic-pituitary axis.

## **Correct Answer: C. Craniopharyngioma**