**Question:** All of the following statements about Tetralogy of Fallot are true, Except

A. Tetralogy of Fallot is a congenital heart defect characterized by pulmonary stenosis, ventricular septal defect, overriding aorta, and right ventricular hypertrophy.
B. Ventricular septal defect (VSD) is a common cause of cyanosis in newborns.
C. Cyanosis is a sign of severe respiratory distress.
D. The defect can be corrected with medications.

**Core Concept:**

Tetralogy of Fallot (ToF) is a congenital heart defect characterized by the presence of four distinct abnormalities: pulmonary stenosis, ventricular septal defect (VSD), overriding aorta, and right ventricular hypertrophy. The defect results in increased blood flow from the right ventricle to the aorta, leading to a mismatch between the oxygenated blood supply to the body and the demand of tissues, causing cyanosis.

**Why the Correct Answer is Right:**

D. The defect is primarily congenital and cannot be corrected with medications. Instead, surgical intervention is required to correct the structural abnormalities.

**Why Each Wrong Option is Incorrect:**

A. This statement directly mentions the key features of Tetralogy of Fallot, making it the correct answer.
B. While Ventricular septal defect is a significant component of Tetralogy of Fallot, medications cannot correct the congenital abnormality.
C. Cyanosis is a symptom resulting from the mismatch between oxygenated blood supply and demand in Tetralogy of Fallot, but it is not primarily responsible for the defect.

**Clinical Pearl:**

Congenital heart defects like Tetralogy of Fallot require a comprehensive understanding of the underlying physiology and pathophysiology to differentiate them from other potential causes of cyanosis, such as respiratory distress. A thorough clinical assessment, including history and examination, is crucial for accurate diagnosis and appropriate management.