## **Core Concept**
Poland Syndrome is a rare congenital disorder characterized by underdevelopment or absence of the pectoralis major muscle on one side of the body. It often presents with other associated anomalies.

## **Why the Correct Answer is Right**
The characteristic feature of Poland Syndrome includes the unilateral absence or hypoplasia of the pectoralis major muscle. This condition often presents with a range of associated anomalies, which can include webbed fingers (syndactyly), short or absent forearm, and other limb abnormalities. The correct answer highlights the key feature of this syndrome.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately describe the characteristic feature of Poland Syndrome.
- **Option B:** This option is incorrect as it also does not represent the typical presentation of Poland Syndrome.
- **Option C:** Although not directly provided, if this option does not mention the pectoralis major muscle underdevelopment or absence, it would be incorrect for the same reason.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl for Poland Syndrome is that it often presents unilaterally and is associated with other limb anomalies. Recognizing the absence or underdevelopment of the pectoralis major muscle is crucial for diagnosis.

## **Correct Answer:** C. Absence of pectoralis major muscle.