You are presented with the quiz "What controls the urination process?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "urine leaves the body through a sphincter in the process of urination" and "muscles around the urethra, called sphincter muscles, control the flow of urine out of the body". 

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


 

     Muscles around the urethra      