You are presented with the quiz "what does ultraviolet light cause?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "ultraviolet light causes sunburn" and "sunburn symptoms are skin redness and pain, possible swelling, blisters, fever, headaches". 

So, what's the best answer to the question?


 

     skin redness and pain, possible swelling, blisters, fever, headaches      