You are presented with the question "What is a central nervous system stimulant?" and the following answer choices: 
- saccharose
 - barbiturates
 - cigarettes
 - sweating
 - muscle relaxants
 - A Greek letter
 - Decibels
 - valium

Now knowing that caffeine is a central nervous system stimulant and likewise, the caffeine and saccharose stimulate the body's stimulation of serotonin, choose the best answer.


 

 saccharose        