**Core Concept:** The question is about the Goeckerman regimen, a treatment modality used for psoriasis. Psoriasis is a chronic inflammatory skin disorder characterized by rapid overgrowth of skin cells, leading to thickened, red, and scaly skin plaques. The Goeckerman regimen is a combination therapy involving topical treatments, phototherapy, and systemic medications.

**Why the Correct Answer is Right:** The correct answer, **D**, refers to the Goeckerman regimen, which comprises the following components:

1. **Topical Coal Tar:** Coal tar slows down skin cell production, reducing the thickness and inflammation of psoriatic plaques.
2. **Ultraviolet Radiation (UVB Phototherapy):** Phototherapy (light therapy) helps to reduce inflammation and improves skin symptoms.
3. **Systemic Methotrexate:** Methotrexate is an immunosuppressive drug that reduces inflammation and slows down skin cell production.

The combination of these three treatments effectively targets both inflammation and cell production, leading to better outcomes for psoriasis patients.

**Why Each Wrong Option is Incorrect:**

A. **Goceclor (Clofazimine and Dapsone):** Goceclor is an antibiotic and anti-inflammatory drug combination, which is incorrect for the Goeckerman regimen.

B. **Topical Steroids and PUVA (Psoralen plus Ultraviolet A):** Topical steroids are anti-inflammatory drugs, but PUVA therapy is a type of phototherapy involving psoralen (a photosensitizing drug) and ultraviolet A radiation, which is not a part of the Goeckerman regimen.

C. **Topical Steroids and UVA Phototherapy:** Topical steroids are anti-inflammatory drugs, and UVA phototherapy is a type of phototherapy that utilizes ultraviolet A radiation. While both are useful therapies for psoriasis, they are not a combination of the three components of the Goeckerman regimen.

**Clinical Pearl:** The Goeckerman regimen is a well-established treatment option for moderate to severe plaque psoriasis, resulting in improved skin symptoms and quality of life for patients. Regular monitoring is crucial for assessing treatment response and managing potential side effects.