**Core Concept**
Microabscess of Munro is a histopathological feature associated with a specific skin condition characterized by the accumulation of neutrophils within the epidermis. This phenomenon is a result of the abnormal immune response and inflammation that occurs in the condition.

**Why the Correct Answer is Right**
In psoriasis, the microabscess of Munro is a hallmark histological finding, resulting from the infiltration of neutrophils into the epidermis. This occurs due to the abnormal activation of keratinocytes and the release of pro-inflammatory cytokines, leading to the recruitment of neutrophils to the site of inflammation. The microabscess of Munro is a key diagnostic feature of psoriasis, differentiating it from other skin conditions.

**Why Each Wrong Option is Incorrect**
**Option A:** Lichen planus is a chronic inflammatory mucocutaneous disease characterized by a band-like lymphocytic infiltrate in the dermis, but it does not typically feature microabscesses of Munro.

**Option C:** Pityriasis rosea is a self-limiting skin condition characterized by an initial herald patch followed by a secondary eruption of oval-shaped, scaly lesions. It does not typically exhibit microabscesses of Munro.

**Option D:** Tuberous sclerosis is a genetic disorder characterized by the development of hamartomas in multiple organ systems, including the skin. However, it does not typically feature microabscesses of Munro.

**Clinical Pearl / High-Yield Fact**
The microabscess of Munro is a key histological feature of psoriasis, and its recognition is essential for the accurate diagnosis of this condition. It is often accompanied by other histological features, such as parakeratosis and Munro's microabscesses, which are characteristic of psoriasis.

**✓ Correct Answer: B. Psoriasis**