## **Core Concept**
Sarcoidosis is a systemic granulomatous disease that can affect virtually any organ, but it most commonly involves the **lungs**, **lymph nodes**, **skin**, and **eyes**. The disease is characterized by the formation of non-caseating granulomas in affected tissues.

## **Why the Correct Answer is Right**
The primary involvement of the **pancreas** as an organ not typically affected by sarcoidosis makes sense given the disease's predilection for certain organs. Sarcoidosis can affect multiple organ systems, but pancreatic involvement is extremely rare. When it does occur, it's often in the context of systemic disease. The pancreas is not among the commonly affected organs like lungs, lymph nodes, skin, or eyes.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The **lungs** are the most commonly affected organ in sarcoidosis, with pulmonary involvement seen in about 90% of patients. Therefore, this option is incorrect.
- **Option B:** **Lymph nodes** are frequently involved, often presenting as hilar lymphadenopathy on chest radiographs. This makes option B incorrect.
- **Option C:** The **skin** is another common site of involvement, with various manifestations such as erythema nodosum, plaques, or papules. Thus, option C is incorrect.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that while sarcoidosis can affect virtually any organ, the **lungs and lymph nodes** are involved in the majority of cases. A classic presentation includes **bilateral hilar lymphadenopathy** (BHL) on chest X-ray, often accompanied by pulmonary symptoms.

## **Correct Answer:** D. Pancreas.