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.

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.
Science

Coombs tests detect these bodies bound to erythrocytes, and a technique that uses these entities is ELISA. These molecules have a namesake fold, in which two beta sheets are held together by amino acid charges. These adaptable molecules can somatically recombine in a process called V(D)J recombination and are also capable of changing isotype by altering conformation of their heavy chains. Like enzymes, they operate via a a so-called "lock-and-key" mechanism, as verified by Linus Pauling. FTP, name these characteristically y-shaped immune molecules exploited in vaccination and produced by B cells in response to specific antigens.
Science

An international collaboration based in this country has produced evidence for bottom-to-down quark transitions and proof of non-kaon CP-violation. This country, which is home to the Belle experiment, also produced a physicist who discovered the temperature-dependence of resistivity due to electron scattering by magnetic impurities. Another physicist from here theorized that mesons carried the nuclear force, predicting the existence of pions. This country, which contains the KEK laboratory, also houses an underground facility where photomultiplier tubes detect rings of Cherenkov radiation in ultra-pure water. That facility found the first evidence of atmospheric neutrino oscillations and is named the Super-Kamiokande. For 10 points, name this birthplace of Jun Kondo and Hideki Yukawa.

Science

