**Core Concept**
Ventricular septal defect (VSD) is a congenital heart defect characterized by an opening in the septum between the left and right ventricles, allowing blood to flow from the left to the right ventricle. This leads to a left to right shunt, causing increased pulmonary blood flow and potentially resulting in pulmonary hypertension.

**Why the Correct Answer is Right**
Reverse splitting of S2 is typically associated with conditions that cause delayed closure of the aortic valve, such as aortic stenosis or aortic regurgitation. In VSD, the split of S2 is usually normal or wide, but not reverse, as the increased flow through the pulmonary valve causes earlier closure of the pulmonary valve, resulting in a normal or wide split of S2.

**Why Each Wrong Option is Incorrect**
**Option A:** Left to right shunt is a characteristic of VSD, as the higher pressure in the left ventricle pushes blood through the defect into the right ventricle.
**Option B:** Pansystolic murmur is a classic finding in VSD, resulting from the turbulent flow of blood through the defect during systole.
**Option D:** Left atrial hypertrophy can occur in VSD due to the increased volume load on the left atrium secondary to the left to right shunt.

**Clinical Pearl / High-Yield Fact**
In VSD, the timing of the split of S2 can be influenced by the size of the defect and the degree of pulmonary hypertension. A large defect may cause an earlier closure of the pulmonary valve, resulting in a narrow split of S2.

**✓ Correct Answer: C. Reverse spitting of S2**