## **Core Concept**
The question tests knowledge of tuberculids, which are skin manifestations associated with tuberculosis but not directly caused by Mycobacterium tuberculosis. These conditions arise due to an immune response to the bacilli or their components. The key features mentioned - involvement of sweat glands and hair follicles with non-caseating epithelioid granulomas - point towards a specific tuberculid.

## **Why the Correct Answer is Right**
The correct answer, **B. Lupus vulgaris**, is a type of cutaneous tuberculosis and the most common form of skin tuberculosis. It typically presents with non-caseating epithelioid granulomas. Lupus vulgaris can involve various parts of the body, including the skin, and can affect hair follicles and sweat glands, leading to scarring and various skin manifestations. The presence of non-caseating granulomas is characteristic, distinguishing it from other forms of tuberculosis that may present with caseating granulomas.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is blank and cannot be evaluated.
- **Option C:** This option is also blank and cannot be evaluated.
- **Option D:** Similarly, this option is blank and does not provide any information for evaluation.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that lupus vulgaris often results in significant scarring and can lead to disfigurement if not treated promptly and effectively. It is also known for its chronic course and potential for reactivations. Early diagnosis and treatment are crucial to prevent long-term damage.

## **Correct Answer: B. Lupus vulgaris**