Pretty sure it means brain, cerebral, or cerebrum!
        
             
        
        
        
Need the picture or we can't see what you're talking about
        
             
        
        
        
Answer:
A) Stimulants
Explanation:
I looked it up!
<em>"Methamphetamine is a potent central nervous system stimulant that is mainly used as a recreational drug and less commonly as a second-line treatment for attention deficit hyperactivity disorder and obesity."</em>
Hope this helped, and good luck on your assignment!