You are presented with the quiz "Mammals can also generate little bursts of heat using natural body reflexes to what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mammals can also generate little bursts of heat by shivering" and "intense shivering and severe pain are natural body reflexes to cold water". 

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


 

     cold water      