**Core Concept**
The conus cordis is the most distal part of the embryonic heart tube, which eventually forms the infundibulum, the right ventricle, and part of the interventricular septum. Unequal division of the conus cordis can lead to various congenital heart defects.

**Why the Correct Answer is Right**
During embryonic development, the conotruncal septum separates the outflow tracts of the heart. Anterior displacement of this septum can cause unequal division of the conus cordis, resulting in defects such as Tetralogy of Fallot (TOF). TOF is characterized by four key features: ventricular septal defect (VSD), pulmonary stenosis, right ventricular hypertrophy, and an overriding aorta. The unequal division of the conus cordis leads to an abnormal relationship between the aorta and the pulmonary artery.

**Why Each Wrong Option is Incorrect**

**Option A:** This option is not described in the context of conus cordis division or conotruncal septum displacement.

**Option B:** This is not a correct association with conus cordis division or conotruncal septum displacement.

**Option C:** This is not a correct outcome of conus cordis division or conotruncal septum displacement.

**Clinical Pearl / High-Yield Fact**
Tetralogy of Fallot is a classic example of a cyanotic congenital heart defect, and understanding its embryological basis can help in diagnosing and managing this condition.

**Correct Answer:** A.