**Core Concept**
Mikulicz cells are a type of dendritic cell found in the lungs, particularly in the context of sarcoidosis. They are involved in the pathogenesis of this disease by presenting antigens to T-cells, leading to an exaggerated cellular immune response.

**Why the Correct Answer is Right**
Mikulicz cells are a hallmark of granulomatous inflammation in sarcoidosis. They are large, foamy-appearing cells with abundant cytoplasm and a large nucleus, and are typically found in the interstitial tissue of the lungs. These cells are derived from activated macrophages and play a key role in the formation of non-caseating granulomas, a characteristic feature of sarcoidosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Mikulicz cells are not typically associated with the skin lesions of lupus erythematosus. While lupus can cause a range of skin manifestations, Mikulicz cells are not a characteristic feature of this disease.
**Option B:** This option is incorrect because Langerhans cells are a type of dendritic cell found in the skin, not Mikulicz cells. Langerhans cells are involved in the presentation of antigens to T-cells in the context of contact dermatitis and other skin diseases.
**Option C:** This option is incorrect because histiocytes are a type of macrophage found in various tissues, but Mikulicz cells are a specific type of dendritic cell found in the lungs in the context of sarcoidosis.

**Clinical Pearl / High-Yield Fact**
Mikulicz cells are a key diagnostic feature of sarcoidosis, and their presence can help differentiate this disease from other causes of granulomatous inflammation.

**Correct Answer:** D.