In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

It is not serotonin, but the selective reuptake of this compound is inhibited by tiagabine, and it is converted to succinic acid semi-aldehyde, which is subsequently oxidized to succinic acid in the shunt which produces this compound. One receptor for it forms a heteropentameric complex and in immature neurons, this compound facilitates the outward flux of chloride ions, which is why benzodiazepines are ineffective anticonvulsants in newborns. One receptor for it includes a benzodiazepine binding site, and isoguvacine THIP, and muscimol serve as competitive agonists to this molecule. Synthesized by the decarboxylation of glutamic acid, this neurotransmitter is best known for its role as the chief inhibitory neurotransmitter. For 10 points, identify this neurotransmitter, which is often referred to by its four letter acronym.
Science

After initiation into the Khalsa (KAHL-sah) in this religion, adherents must wear a wooden comb, known as the "kanga"(KAHN-gah), and a steel bracelet, known as the "kara" (KAH-rah), which are two of the five K's. Arjun (AR-joon) Dev compiled this religion's holy text, the Adi Granth, which contains many of the sayings of the first leader, or guru, of this religion. For 10 points, identify this religion founded by Nanak, whose adherents are mostly found in the Punjab region.
Social Science

The Nozicki-Hiyama-Kishi reaction uses organometallic compounds featuring chromium or this element. It can be extracted from its oxide ore through heating in the presence of a mixture of hydrogen gas and carbon monoxide to yield a tetracarbonyl intermediate, which decomposes to yield four carbon monoxides in a process named for Mond. The diffraction pattern resulting from x rays fired at a crystal of this element provided evidence for the wave-particle duality in the Davisson-Germer experiment. A catalyst used to hydrogenate alkenes contains this element and aluminum, and is named for Raney. For 10 points, name this element with atomic symbol Ni.

Science

