**Core Concept**
Basal cell carcinoma (BCC) is a type of skin cancer characterized by its aggressive local growth and potential for destruction of surrounding tissue. It is the most common type of skin cancer, accounting for approximately 80% of all skin cancer cases.

**Why the Correct Answer is Right**
Nuclear palisading is a characteristic histopathological feature of basal cell carcinoma. It refers to the arrangement of nuclei in a palisade-like pattern, where the nuclei are aligned in a row, resembling a picket fence. This feature is due to the peripheral location of the basal cell carcinoma cells, which push the surrounding tissue apart, creating a characteristic appearance. Nuclear palisading is often seen in well-differentiated BCCs and is a useful diagnostic feature in distinguishing BCC from other types of skin lesions.

**Why Each Wrong Option is Incorrect**
**Option A:** Keratin pearls are characteristic of squamous cell carcinoma, not basal cell carcinoma. Squamous cell carcinoma is another type of skin cancer that often presents with keratin pearls.

**Option B:** Foam cells are typically associated with xanthomas, a type of skin condition characterized by the accumulation of lipid-laden macrophages. Foam cells are not a characteristic feature of basal cell carcinoma.

**Option D:** Psammoma bodies are calcified structures often seen in papillary thyroid carcinoma and other papillary neoplasms. They are not a characteristic feature of basal cell carcinoma.

**Clinical Pearl / High-Yield Fact**
When evaluating skin lesions, remember that basal cell carcinoma often presents with a characteristic "pearly" appearance due to the peripheral location of the tumor cells. This can be a useful diagnostic clue in distinguishing BCC from other types of skin lesions.

**Correct Answer:**
✓ Correct Answer: C. Nuclear palisading