**Core Concept**
Cantrell's Pentad is a rare congenital anomaly characterized by a combination of five specific defects: a midline supraumbilical abdominal wall defect, a lower sternal defect, a diaphragmatic hernia, an ectopic cord, and a congenital heart defect. This condition arises due to the failure of the mesodermal layer to properly close during embryonic development.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of Cantrell's Pentad, which involves the disruption of the mesodermal layer during embryonic development. This disruption leads to the formation of multiple defects, including the ones mentioned above. The defects are thought to result from the incomplete closure of the thoracoabdominal wall and the diaphragm.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe a component of Cantrell's Pentad. While an omphalocele (exomphalos) is a congenital defect involving a herniation of abdominal contents through the navel, it is not a specific component of Cantrell's Pentad.
**Option B:** This option is incorrect because it is actually a component of Cantrell's Pentad. The presence of a congenital heart defect is a key feature of this condition.
**Option C:** This option is incorrect because it is also a component of Cantrell's Pentad. A diaphragmatic hernia is a common finding in patients with Cantrell's Pentad.
**Option D:** This option is incorrect because it is not a component of Cantrell's Pentad. An omphalocele is a distinct congenital defect, whereas Cantrell's Pentad specifically includes a midline supraumbilical abdominal wall defect.

**Clinical Pearl / High-Yield Fact**
Cantrell's Pentad is a rare but critical congenital anomaly that requires prompt recognition and management. It is essential to evaluate patients with suspected Cantrell's Pentad for multiple defects, including congenital heart disease, diaphragmatic hernia, and abdominal wall defects.

**Correct Answer: D. Omphalocele**