**Core Concept**
The Tetralogy of Fallot (TOF) is a congenital heart defect characterized by four essential criteria. Understanding these criteria is crucial for diagnosis and management of TOF. The four classic criteria were first described by Fallot in 1888.

**Why the Correct Answer is Right**
The four essential criteria for TOF include:
- Ventricular septal defect (VSD): A communication between the left and right ventricles, allowing blood to shunt from the left to the right ventricle.
- Pulmonary stenosis: Narrowing of the pulmonary valve or outflow tract, obstructing blood flow from the right ventricle to the pulmonary artery.
- Right ventricular hypertrophy: Thickening of the right ventricular wall, resulting from increased workload due to the VSD and pulmonary stenosis.
- Overriding aorta: The aorta is positioned over the VSD, allowing it to receive blood from both the left and right ventricles.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not listed, so we will move on to the next one.
* **Option B:** This option is also not listed, so we will move on to the next one.
* **Option C:** This option is also not listed, so we will move on to the next one.

**Clinical Pearl / High-Yield Fact**
The clinical presentation of TOF often includes cyanosis, clubbing, and failure to thrive. Echocardiography is the primary diagnostic tool, showing the characteristic findings of TOF.

**Correct Answer:** Not provided (the options A, B, and C are missing)