## Core Concept
A Ventricular Septal Defect (VSD) is a common congenital heart defect characterized by an opening in the interventricular septum, allowing blood to flow directly between the left and right ventricles. This can lead to various complications, including heart failure, pulmonary hypertension, and increased risk of infections. VSDs can vary in size and location.

## Why the Correct Answer is Right
The correct answer, ., implies that option is the statement that is not true about VSD. Typically, large VSDs can lead to significant left-to-right shunting, resulting in increased pulmonary blood flow, which can eventually cause pulmonary hypertension. Over time, this can lead to a reversal of the shunt (Eisenmenger's syndrome), characterized by right-to-left shunting and cyanosis. However, without specific details on the options, we focus on general principles.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically, VSDs are associated with a harsh holosystolic murmur best heard at the lower left sternal border, due to blood shunting from the left to the right ventricle throughout systole. If option describes a characteristic feature of VSD, such as this murmur, then it would be correct, making the incorrect statement.
- **Option B:** If option mentions a known complication or association of VSD, such as heart failure or pulmonary hypertension, and it is accurate, then would be the incorrect statement.
- **Option C:** Similar to option B, if accurately describes a feature, cause, or consequence of VSD, then is the statement that does not belong.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the size and location of a VSD significantly influence its clinical presentation and management. Small VSDs (less than 3 mm) often close spontaneously and are known as "restrictive" VSDs. Large VSDs require surgical intervention to prevent complications like heart failure and pulmonary hypertension.

## Correct Answer: D.