You are presented with the quiz "Antigens are molecules that the immune system recognizes as needing to be what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "antigens are molecules that the immune system recognizes as foreign to the body" and "rejection is a normal reaction of the body to a foreign object". 

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


 

       rejected from the body    