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.

Input: Consider Input: This element's only oxidation state is -1, and it is impossible to free from its compounds by chemical means. It is prepared commercially be the same method which Henri Moisson used to isolate it in 1886, and is also found in the mineral cryolite. Its only isotope is the stabe 19 version, and in its gaseous form takes on a pale yellow color. The most electronegative and reactive of the elements, FTP, what is this lightest of the halogens with atomic number 9 and symbol F

Output: Science


Input: Consider Input: Laplaces rule may be used to compute a version of this quantity for its namesake tensor in order to prove the Alon-Tarsi conjecture for Latin squares of even order; that proof uses Cayleys version of this operator. The Cauchy-Binet rule generalizes it to commutative rings, while Leibnizs formula uses permutations of elements to compute it. Setting to zero the result of this operation on lambda I minus A allows us to calculate As eigenvalues. Cramers rule uses ratios of these to solve systems of linear equations. For ten points, name this quantity that is a d minus c b for a 2 by 2 matrix a b c d.

Output: Science


Input: Consider Input: A church in this novel is called First Purchase because it was the first thing bought by freed slaves. The protagonist of this novel is frightened by Cecil Jacobs while in a ham costume. The protagonist of this novel helps to break up a potential lynch mob whose target is a man wrongly accused of raping Mayella Ewell, Tom Robinson. That event sees the protagonist accompanied by (*) Dill and her brother Jem, who breaks his arm in an attack largely thwarted by Boo Radley. For 10 points, name this novel featuring Scout and Atticus Finch by Harper Lee.


Output: Literature