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.

[Q]: 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.
[A]: Science

[Q]: Racial violence in this city began with the 1909 lynching of William James, as well as the later 1967 murder of black soldier Robert Hunt. Its Chief of Police was shot in 1969 violence stopped when Governor Richard Ogilvie sent in the National Guard. Rooster Cogburn opened a bar here after the Civil War, and it was the inspiration for Eden in Charles Dickens' Martin Chuzzlewit. Stephen Foster wrote a song about being "way down" in this city, which is where Magnolia Manor and Fort Defiance State Park are located. Huck and Jim intend to go to this city to obtain Jim's freedom in Huckleberry Finn, but they end up sailing past it. This city has the lowest elevation of any within Illinois and is located at the confluence of the Mississippi and Ohio Rivers. For 10 points, name this southernmost city in Illinois, which shares its name with a city in Egypt.
[A]: History

[Q]: Lindstrom's theorem states that first-order logic is the strongest logic having both this property and satisfying the Lowenheim-Skolem property. A method for finding a Hausdorff space with this property containing a given space is named for Stone and Cech. Equicontinuity is the main condition for determining whether a family of functions has this property by the Arzela-Ascoli theorem. Using the axiom of choice, it can be shown that an arbitrary product of spaces with this property has this property, a result known as Tychonoff's theorem. In Euclidean space, being closed and bounded is sufficient to show, according to the Heine-Borel theorem, that a set has this property. For 10 points, identify this property which holds of a set on which every open cover has a finite subcover.
[A]:
Science