Final answer:
The correct answer is Dexedrine.
Step-by-step explanation:
The correct answer to the question is Dexedrine. Among the options provided, GHB, Quaalude, and Xanax are all central nervous system depressants. They work primarily through enhancement of the neurotransmitter GABA, which has an inhibitory, calming effect on the brain. Depressants like these are commonly used to treat conditions such as anxiety and insomnia because of their ability to produce sedation and reduce nervous system activity.
Dexedrine, on the other hand, is a stimulant and not a depressant. It falls under the class of drugs known as amphetamines, which stimulate the central nervous system, leading to increased alertness and wakefulness. Stimulants like Dexedrine are often prescribed for conditions such as attention deficit hyperactivity disorder (ADHD) because they can help to increase focus and decrease impulsivity and hyperactivity.
In summary, whereas depressants, including alcohol, reduce nervous system activity and induce sedation, stimulants like Dexedrine increase nervous system activity and enhance alertness.