## **Core Concept**
Lichen planus is a chronic inflammatory mucocutaneous condition characterized by an autoimmune response. It involves the skin, mucous membranes, and occasionally, the nails and hair follicles. The condition is known for its distinctive histopathological features.

## **Why the Correct Answer is Right**
The correct answer includes features such as **pruritus**, **flat-topped polygonal papules**, and **histological findings like basal cell degeneration, Civatte bodies, and a band-like lymphocytic infiltrate**. These features are hallmarks of lichen planus. The condition often presents with intense itching and specific skin lesions that are typically purple in color.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While lichen planus does involve the skin and can cause significant discomfort, stating just one symptom like pruritus without acknowledging other diagnostic features makes it incomplete.
- **Option B:** This option might mention a feature not commonly associated with lichen planus or omit critical diagnostic criteria.
- **Option C:** Similarly, this might include a feature not typical for lichen planus or miss key aspects.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that lichen planus can affect various parts of the body, including the skin, oral mucosa (oral lichen planus), and other areas. The presence of **Koebner phenomenon**, where lesions develop at the site of skin injury, is also a notable feature.

## **Correct Answer: D.**