You are presented with the quiz "What is used to cool the body when it is hot?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when the body is hot , sweat is produced to cool the body" and "sweat is released from sweat glands beneath the skin, and as it evaporates, the skin is cooled". 

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


 

     evaporation      