You are presented with the question "What do male dogs use to mark their territory?" and the following answer choices: 
- smell
 - H 2 O
 - love
 - intuition
 - gourdin
 - tongue
 - sight
 - fur

Now knowing that male dogs use pheromones in urine to mark their territory and pheromones are hormones that are thought to stimulate, through smell, sexual reactions in animals, choose the best answer.


 

 smell        