You are presented with the question "What stimulates the central nervous system?" and the following answer choices: 
- nicotine
 - exercise
 - a chime
 - Energy
 - A computer
 - sweating
 - a doorbell
 - acetic acid

Now knowing that caffeine is a central nervous system stimulant and like caffeine, nicotine is a stimulant, choose the best answer.


 

 nicotine        