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.

[EX Q]: One variant of this phenomenon can be used to tune the electronic properties of boron nitride nanotubes from nearly insulating to metallic. Another variant of this phenomenon is induced by interference of standing laser waves to trap atoms of a Bose-Einstein condensate loaded into an optical lattice. Schrdinger's third article from his 1926 series of papers presented his perturbation theory treatment of this effect's modification of the Balmer and Lyman series. Along with van der Waals broadening and resonance broadening, this effect can produce pressure broadening of spectral lines. In addition to the giant version and the AC or Autler-Townes form of this effect, it exhibits variants that are linear and quadratic in the applied field. FTP name this shifting and splitting of spectral lines due to an external electric field, the analogue of the Zeeman effect.
[EX A]: Science

[EX Q]: This country produced a film whose title character rebels against Pedro de Ursua during a search for El Dorado, Aguirre, the Wrath of God. In another film from this country, Francis and Jane investigate the sleepwalking Cesare, who is kept in the title object. The title sea vessel of another film from this country is heavily damaged after refueling in La Spezia and a majority of its crew is killed in a facility bombing. Two other films from here involve Elsie's murder by Beckert and Rotwang's creation of Maria's robot double. This country produced The Cabinet of Dr. Caligari, Das Boot, M, and Metropolis. For 10 points, name this country home to the director Fritz Lang.
[EX A]: Fine Arts

[EX Q]: An important moment in this nation's history was the June 16 1960 "Mueda Massacre. "  Ruled by Maoist leader Samora Machel for much of the 1970s and 1980s, in 1992 the U.N. helped end a prolonged Civil War between the resistance movement Renamo and the leading party. Its current president, Joaquim Chissano, is a member of that party, Frelimo, which earlier had led its fight for independence from Portugal. FTP, identify this African nation containing the Zambezi delta which is separated from Madagascar by its namesake channel and has its capital at Maputo.
[EX A]:
History