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]: Lin and Shu proposed the density-wave theory to explain how the structure of these entities is sustained. The most accurate method for measuring the distances to distant ones uses a relation between their maximum rotational velocity and absolute magnitude, which is known as the Tully-Fisher method. They are generally blue because of their high content of old stars, and one type of them features arms that emanate from each end of a namesake structure. They have discs like the lenticular type, but contain much more angular momentum than the elliptical type. FTP name these galaxies, some of which are barred, including the Milky Way.
[A]: Science

[Q]: Paulo Ribenboim proved in 1991 that the set of these is Diophantine, and in 1912 Edmund Landau proposed four "unattackable problems" dealing with them, none of which have yet been solved. The theorem named for them states that the number of them less than or equal to n is approximately equal to n divided by the natural logarithm of n. The GIMPS project seeks to find examples of the Mersenne type of this number, ordinary examples of which can be found using the sieve of Eratosthenes. For 10 points, identify these numbers whose only two factors are 1 and itself.
[A]: Social Science

[Q]: The adultery on both parts of the married couple Edward and Charlotte with Ottilie and the Captain, respectively, forms the basis of this authors novel Elective Affinities. He wrote about the title lord of Gaure's arrest by Alva in one drama, while he also wrote a novel about a character who refuses to study business and instead works with Marianne and Mignon in the theater, as well as another about Lotte spurning the love of the title character, resulting in his suicide. In addition to Egmont, Wilhelm Meister's Apprenticeship, and The Sorrows of Young Werther, this author also wrote a two-part poetic drama about the death of the title character attempting to save Gretchen after making a wager with Mephistopheles. FTP, name this German author of Faust.
[A]:
Literature