Which of the following physical carcinogens is the cause of most skin cancers in humans?Group of answer choicesUltraviolet lightGamma raysInfra-red lightX-rays

Analysis of the Options

1. Ultraviolet light: This is known to cause mutations in the DNA of skin cells, leading to skin cancer. It is the primary carcinogen associated with skin cancer.

2. Gamma rays: While gamma rays are a form of ionizing radiation that can cause cancer, they are more associated with deeper tissue and organ cancers than skin cancer.

3. Infra-red light: This type of light is generally not considered a carcinogen. It primarily causes thermal damage rather than direct DNA damage.

4. X-rays: Like gamma rays, X-rays are also ionizing radiation that can cause cancer, but they are typically associated with other types of cancers and are not the main cause of skin cancers.

Conclusion

The primary cause of most skin cancers in humans is Ultraviolet light. This conclusion is supported by extensive research linking UV radiation exposure to the development of skin cancers, including melanoma and non-melanoma skin cancers.