Pick your answer from: [+] sugar. [+] gills. [+] h2o. [+] lungs. [+] aorta. [+] bowel. [+] fungi. [+] honey.

You are presented with the quiz "what helps make up the excretory system?" 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 "excess estrogen is excreted in the bowel". So, what's the best answer to the question?
Answer:
bowel