Fact 1: Caffeine is a central nervous system stimulant.

Fact 2: Cocaine is a stimulant and increases the user's heart rate and blood pressure.

Given the two facts above, answer the question "What does caffeine do?" with the following options: 
- Increase fame
 - increases a body's strength
 - Release energy
 - Increase user's heart rate
 - Transfers energy
 - decrease stamina
 - Increase intelligence
 - Increase wealth


 

    Increase user's heart rate     