You are presented with the quiz "what is the throwing up center of the brain used for?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the vomiting reflex is used to remove toxic material from the stomach before it is absorbed" and "vomiting is a reflex controlled by a vomiting center in the brain". 

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


 

     remove toxic material from the stomach before it is absorbed      