You are presented with the quiz "Urine is a product of what organ of the body that is excreted by the urinary system?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "urine is the liquid waste product of the body that is excreted by the urinary system" and "liquid waste is put into the bladder". 

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


 

   bladder        