## **Core Concept**
Bürger's disease, also known as thromboangiitis obliterans, is a rare disorder characterized by inflammation and clotting of small and medium-sized blood vessels, typically affecting the hands and feet. This condition leads to reduced blood flow to the affected areas, resulting in pain, tissue damage, and potentially gangrene. The disease primarily affects the arterial system.

## **Why the Correct Answer is Right**
The correct answer involves understanding which of the listed options is not typically involved in Bürger's disease. Bürger's disease primarily affects the small and medium-sized arteries and veins, leading to their occlusion. This condition is known for its involvement of the blood vessels in the limbs.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because Bürger's disease does involve arteries.
- **Option B:** This option is incorrect because veins are also involved in the disease process of Bürger's disease.
- **Option C:** This option might seem plausible but given the context, it's less directly related to the typical description of involvement.

## **Why Option D is Correct and Each Wrong Option is Incorrect**
- **Option D:** Lymphatics are not primarily involved in the disease process of Bürger's disease. The main pathology involves the arterial and venous systems rather than the lymphatic system.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that Bürger's disease is strongly associated with smoking. In fact, cessation of smoking is considered crucial in the management of the disease, as continued smoking can lead to progression and worsening of symptoms.

## **Correct Answer:** D. Lymphatics.