Fact 1: Competition may lead to aggressive behaviors or displays of aggression.

Fact 2: Aggression is the drive, the adrenaline, the power.

Given the two facts above, answer the question "Competition may lead to release of " with the following options: 
- Chemical energy
 - dopamine
 - insulin
 - heat energy
 - emissions
 - growth hormone
 - adrenaline
 - Energy


 

       adrenaline  