You are presented with the quiz "What does the substance that male dogs have in urine to mark their territory do?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "male dogs use pheromones in urine to mark their territory" and "males produce 'pheromones' to attract females". 

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


 

  attract females         