Which of the following drugs can be classified as a sedative-hypnotic?

The classification of drugs into categories is based on their effects on the central nervous system (CNS). Sedative-hypnotics are substances that primarily induce sedation (calmness, sleepiness) and can facilitate sleep. Quaaludes, which contain the active ingredient methaqualone, are classic examples of sedative-hypnotics. They function by depressing the CNS, leading to effects such as relaxation, decreased anxiety, and induced sleep.

The other substances listed do not fall under the category of sedative-hypnotics. Amphetamines are stimulants, increasing alertness and energy levels rather than inducing sedation. Cocaine is also a stimulant, known for its euphoric and energizing effects, not for causing sleepiness. Nicotine, primarily associated with tobacco products, acts as a stimulant and can lead to increased heart rate and alertness rather than sedation. Therefore, Quaaludes are correctly identified as the drug that fits the sedative-hypnotic classification.