## **Core Concept**
Skin cancers are primarily caused by exposure to ultraviolet (UV) radiation from the sun. This radiation damages the DNA in skin cells, leading to mutations that can cause cancer. The main types of skin cancers associated with sun exposure are basal cell carcinoma, squamous cell carcinoma, and melanoma.

## **Why the Correct Answer is Right**
The correct answer involves the understanding that UV radiation, specifically UVB, is a major risk factor for skin cancers. UVB radiation is largely responsible for causing mutations in the **p53 tumor suppressor gene**, which plays a critical role in regulating cell division and preventing the proliferation of cells with damaged DNA. When UVB radiation induces mutations in this gene, it can lead to uncontrolled cell growth and tumor formation.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because while UV radiation is indeed a form of electromagnetic radiation, the specificity to skin cancer development is more accurately attributed to UVB rather than UVA alone. UVA also contributes to skin aging and can play a role in skin cancer, but UVB is more directly implicated in DNA damage leading to cancer.
- **Option B:** This option is incorrect because it does not specify the type of radiation or the mechanism by which skin cancers develop. Without context, it's too vague to be correct.
- **Option C:** This option might seem plausible because infrared radiation is a component of sunlight. However, infrared radiation is not directly implicated in the DNA damage that leads to skin cancer. Its primary effect is heating of the skin.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **UVB radiation is most intense during peak sun hours (10am-4pm)**, and using broad-spectrum sunscreens that protect against both UVA and UVB, wearing protective clothing, and seeking shade during these hours can significantly reduce the risk of skin cancer.

## **Correct Answer:** . UVB radiation.