sunburn on the skin surface disinfection of the skin tissues feeling of warmth on the skin immediate death of skin cells
I gave my students this multiple choice question: What is the effect of absorption of infrared light by human skin?

Only one answer is correct among these 4 choices:
- sunburn on the skin surface
- disinfection of the skin tissues
- feeling of warmth on the skin
- immediate death of skin cells

Could you tell me which one is correct?

feeling of warmth on the skin