Which of the following is an example of a benzodiazepine?

Benzodiazepines are a class of medications primarily used to treat conditions such as anxiety, insomnia, and seizures. They work by enhancing the effect of a neurotransmitter called gamma-aminobutyric acid (GABA) in the brain, which has a calming effect on the nervous system. Xanax, which belongs to this category, is commonly prescribed for anxiety and panic disorders, making it a clear example of a benzodiazepine.

In contrast, other options provided in the question represent different categories of substances. PCP, also known as phencyclidine, is a dissociative anesthetic with hallucinogenic properties. Molly, often referring to MDMA (3,4-methylenedioxymethamphetamine), is an empathogen and stimulant commonly associated with recreational use, particularly in party settings. Marijuana, or cannabis, is an herb that has psychoactive properties primarily due to its content of THC (tetrahydrocannabinol) and is used both recreationally and medicinally, but does not fall under the category of benzodiazepines. Hence, Xanax stands out as the representative example of a benzodiazepine among the options given.