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: The aristocratic Fourteen Families survived the crash of this country's indigo industry by slavedriving their way into coffee-producing wealth, while its natoional tradition venerates the Pipil warriors who repelled Pedro de Alvorado. Occult enthusiast Maximiliano Hernandez Martinez responded to Farabundo Marti's 1932 peasant uprising in this country by initiating a brutally systematic mass murder of its citizens known as "the slaughter, or la matanza. Roberto D'Aubuisson, the founder of this country's ARENA party, was revealed to be incurably genocidal and implicated in the deaths of Rutilio Grande and Archbishop Oscar Romero. Tensions over the border near the Gulf of Fonseca were ignited by a 1970 FIFA qualifying match, leading this country and Honduras to fight the soccer war. For 10 points, name this Central American country with capital at San Salvador.

A: History
****
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: Miller's algorithm is sometimes used to generate a recurrence relation for these entities, and Steed's method simultaneously calculates both them and their derivatives. e to the i z cos  is equal to the sum from n equals negative to positive infinity of i to the n times e to the i n  times this function of z by the Jacobi-Anger expansion. By Mehler's formula, ones of order (*) zero are proportional to the integral from 0 to infinity of the sin of x cosh t dt, while the ones of order plus or minus one-half are equal to the square root of 2 over pi x, times cos or sin x. They are the solutions to the equation x squared d squared y d x squared plus x dy dx plus y times quantity x squared minus  squared equals zero, their namesake's differential equation, but are also used in the solution to the Laplace differential equation in spherical and/or cylindrical coordinates. For 10 points, name these functions denoted by J(x) and named after a German astronomer.

A:
Science
****