Which drug is an example of an anti-anxiety tranquilizer?

Xanax is a well-known anti-anxiety medication, classified as a benzodiazepine. It works by enhancing the effects of a neurotransmitter in the brain called gamma-aminobutyric acid (GABA), which plays a significant role in regulating anxiety, calming the nervous system, and promoting relaxation. This mechanism makes Xanax effective in treating anxiety disorders and panic attacks.

The other options represent different categories of drugs. Thorizine is an antipsychotic medication primarily used to treat conditions like schizophrenia. Seconal is a barbiturate, mainly used as a sedative or for sleep disorders rather than for anxiety specifically. Marinol, consisting of synthetic THC, is primarily used for nausea and appetite stimulation rather than as a tranquilizer.