**Core Concept**
Turner Syndrome is a genetic disorder characterized by the partial or complete absence of one X chromosome, leading to various physical and developmental abnormalities. The condition affects approximately 1 in 2,500 live-born females, with a higher prevalence in individuals with a family history of the condition. The clinical manifestations of Turner Syndrome are diverse and include physical, developmental, and reproductive issues.

**Why the Correct Answer is Right**
Umbilical Hernia is not a characteristic feature of Turner Syndrome. Individuals with Turner Syndrome often exhibit a range of physical abnormalities, including webbing of the neck (due to the presence of a low-set posteriorly rotated scapula and/or a broad chest), cubitus valgus (a condition where the elbow joint is more pronounced and the forearm is turned outward), and coarctation of the aorta (a narrowing of the aorta that can lead to high blood pressure and other cardiovascular issues). These features are associated with the abnormal development of the cardiovascular and musculoskeletal systems.

**Why Each Wrong Option is Incorrect**
**Option A:** Webbing of the neck is a characteristic feature of Turner Syndrome, resulting from the abnormal development of the shoulders and chest. This is due to the presence of a low-set posteriorly rotated scapula and/or a broad chest.
**Option B:** Cubitus valgus is a common finding in individuals with Turner Syndrome, caused by the abnormal growth of the long bones in the arm. This leads to a more pronounced elbow joint and a turned-out forearm.
**Option D:** Coarctation of the aorta is a cardiovascular abnormality frequently associated with Turner Syndrome, resulting from the narrowing of the aorta. This can lead to high blood pressure and other cardiovascular issues.

**Clinical Pearl / High-Yield Fact**
Individuals with Turner Syndrome are at an increased risk of developing cardiovascular abnormalities, including coarctation of the aorta, bicuspid aortic valve, and hypertension. These patients should undergo regular cardiac evaluations to identify and manage any underlying cardiovascular issues.

**✓ Correct Answer: C. Umbilical Hernia**