## **Core Concept**
The question pertains to the radiological appearance of the heart on a chest X-ray, specifically the "boot-shaped" heart configuration. This characteristic shape is associated with certain congenital heart diseases that lead to right ventricular hypertrophy.

## **Why the Correct Answer is Right**
The "boot-shaped" heart on a chest X-ray is classically seen in **Tetralogy of Fallot (TOF)**. TOF is a congenital heart defect characterized by four components: ventricular septal defect, pulmonary stenosis, right ventricular hypertrophy, and an overriding aorta. The right ventricular hypertrophy causes the right ventricle to become more prominent, leading to the characteristic boot-shaped or "coeur en sabot" appearance of the heart on a chest X-ray.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not correspond to the correct diagnosis associated with a boot-shaped heart.
- **Option B:** This option is incorrect as it does not represent the condition known for causing a boot-shaped heart on chest X-ray.
- **Option D:** This option is incorrect because it is not the condition characterized by a boot-shaped heart configuration.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the boot-shaped heart is a hallmark radiographic finding in Tetralogy of Fallot. This condition is a cyanotic congenital heart defect, and its diagnosis is critical for surgical planning and management. Remembering this association can help in quickly identifying TOF on a chest X-ray.

## **Correct Answer: C. Tetralogy of Fallot**