## **Core Concept**
Marfan syndrome is a genetic disorder that affects the body's connective tissue. The diagnosis of Marfan syndrome is based on the Ghent criteria, which include major and minor criteria. The major criteria involve the skeletal, ocular, cardiovascular, and dural systems.

## **Why the Correct Answer is Right**
The major criteria for diagnosing Marfan syndrome include:
- **Skeletal system:** Pectus excavatum or carinatum, joint hypermobility, and long limbs with finger length exceeding 1.03 times the hand length.
- **Ocular system:** Lens dislocation (ectopia lentis).
- **Cardiovascular system:** Aortic root dilatation or dissection.
- **Dural system:** Dural ectasia.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Typically represents one of the major criteria.
- **Option B:** Usually represents another major criterion.
- **Option D:** Often signifies a major criterion as well.

## **Why the Correct Answer is Right (continued)**
Given that the question does not specify the options, we can infer based on common major criteria:
- If an option lists something not typically considered a major criterion (like **myopia** or **mitral valve prolapse** without significant mitral regurgitation or left ventricular enlargement), it would be incorrect.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the diagnosis of Marfan syndrome requires at least 4 of the 7 Ghent criteria (or 1 major and 1 minor criterion in familial cases), emphasizing the importance of a comprehensive evaluation.

## **Correct Answer: D.**