You are presented with the quiz "What are organs of excretion?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "organs of excretion make up the excretory system" and "excretory system is composed of a dorsal excretory gland and a pair of Malpighian tubules". 

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


 

  Malpighian tubes         