**Core Concept**
Basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) are the two most common types of skin cancers, but another type of skin cancer that is associated with exposure to light, particularly ultraviolet (UV) radiation, is Merkel cell carcinoma (MCC). MCC is a rare, aggressive skin cancer that arises from Merkel cells, which are specialized epidermal cells involved in touch sensation.

**Why the Correct Answer is Right**
MCC is strongly associated with UV radiation exposure, particularly from the sun or tanning beds. The exact mechanism is not fully understood, but it is believed that UV radiation causes mutations in the Merkel cells, leading to the development of cancer. MCC often presents as a painless, firm, or hard nodule or bump on sun-exposed areas of the body, such as the face, neck, or arms.

**Why Each Wrong Option is Incorrect**
**Option A:** Basal cell carcinoma (BCC) is the most common type of skin cancer, but it is not as strongly associated with UV radiation exposure as MCC.
**Option B:** Squamous cell carcinoma (SCC) is also a common type of skin cancer, but it is more closely associated with HPV infection and other factors.
**Option C:** Melanoma is the most aggressive and deadliest type of skin cancer, but it is not specifically associated with UV radiation exposure in the same way as MCC.

**Clinical Pearl / High-Yield Fact**
Merkel cell carcinoma often presents with lymphadenopathy (swollen lymph nodes) and can metastasize quickly, making it a high-priority diagnosis in patients with unexplained skin lesions or lymph node enlargement.

**Correct Answer: D. Merkel cell carcinoma.