**Core Concept**
Keratoderma Blenorrhagica is a skin manifestation associated with reactive arthritis, a type of spondyloarthritis. It is characterized by the development of hyperkeratotic, erythematous, and sometimes vesicular lesions on the palms and soles, often accompanied by other systemic symptoms.

**Why the Correct Answer is Right**
The correct answer is related to the underlying pathophysiology of reactive arthritis, which is triggered by an abnormal immune response to an infection, typically Chlamydia trachomatis. The skin manifestations of Keratoderma Blenorrhagica are thought to result from the activation of T cells and the production of pro-inflammatory cytokines, leading to the characteristic skin lesions. The lesions are often accompanied by other systemic symptoms, such as conjunctivitis and urethritis, which are also characteristic of reactive arthritis.

**Why Each Wrong Option is Incorrect**
**Option A:** Psoriasis is a chronic autoimmune skin condition characterized by scaly, erythematous plaques, but it is not typically associated with reactive arthritis.
**Option B:** Erythema nodosum is a type of skin inflammation that can be associated with various conditions, including infections and autoimmune disorders, but it is not a specific manifestation of reactive arthritis.
**Option C:** Pityriasis rosea is a skin condition characterized by a distinctive rash, but it is not typically associated with reactive arthritis.

**Clinical Pearl / High-Yield Fact**
Keratoderma Blenorrhagica is often considered a "marker" for reactive arthritis, and its presence should prompt a thorough investigation for underlying infections and other systemic symptoms.

**Correct Answer:** D.