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]: In topological insulators, one version of this effect gives rise to a defect-resistant current induced by spin-orbit coupling. In graphene, this effect is shifted by one half, giving rise to an anomalous minimum of the relevant quantity, which can allow for ballistic transport. A more complex version of it was discovered in gallium arsenide and can be explained by Laughlin quasiparticles; this is referred to as the fractional version. This effect can be understood in terms of partial filling of Landau levels and has characteristic "plateaus", and it yields numbers called filling factors. Discovered by Klaus von Klitzing when studying a two-dimensional electron gas, for 10 points, identify this effect in which conductivity in a strong magnetic field is quantized.
[A]: Science

[Q]: This man told the story of the creation of the world to Hnossa while her mother was searching for her husband. Among the possessions of this mythological being, who lives in the Heavens Palace or Sky Mountain, includes the sword Hofund and his horse Gulltopp. The son of the nine daughters of Aegir, this god, with the nicknames of Vindhlr, meaning wind shelter, and Gullintanni, meaning golden-toothed, recovered Brisingamen after it was stolen from Freya. Even though he sacrificed an ear to drink from Mimir's well, this god has extraordinary hearing, which he uses to hear the grass grow. FTP, identify this Norse mythological figure who will blow Gjallahorn at Ragnarok, the guardian of Bifrost bridge.
[A]: Social Science

[Q]: In January 1862 two men were released from prison by order of Secretary of State Seward. One, John Slidell, was accredited to France, while the other, James Mason, was a representative of Great Britain. They were taken prisoner in the first place because they were known commissioners of the Confederacy. For ten points, Union Captain Charles Wilkes of the ship San Jacinto captured Mason and Slidell from what British mail steamer, causing a rift in American and British relations
[A]:
History