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.

When reacted with a nitrile, they produce an imine anion that can be hydrolyzed into a ketone, and they can cause nucleophilic ring opening of epoxides. Pouring a solution of them over dry ice followed by protonation results in carboxylic acids, which will not form addition products with these. One of their most common uses is reacting with aldehydes and ketones to form secondary and tertiary alcohols, respectively. Because they essentially act as carbanions, they can be protonated by weak acids to yield alkanes. FTP name these organometallic reagents that are formed by reacting an alkyl halide with magnesium, named for their French discoverer.
Science

Two pianos and six percussionists are featured in one section of its third part, which opens with a chorus of boys who sing that Cupid is flying everywhere. The following section of this work features three glockenspiels and is known as "Blanziflor and Helena. " Earlier sections include "On the Lawn," which features the German "Reie" dance, and "In Springtime. " Originally staged in 1937 by the Frankfurt Opera, it begins and ends with a section about the "Imperatrix Mundi. " FTP, name this orchestral work notable for its blaring "O Fortuna" section, which was based on a medieval manuscript and written by Carl Orff.
Fine Arts

He was influenced by the Utrecht School and Carel Fabritius, of whose works he owned several and under whom he may also have studied. Among his less famous works are Woman with a Balance, whose wide interpretations include the soul's peril before worldly temptation, female virtue or grace, or the divine truth of revealed religion, while he is also known for several paintings featuring women reading letters such as Girl Reading a Letter at an Open Window, and for his allegory The Art of Painting sometimes known as The Artist in His Studio. Only recently firmly believed to be the actual painter of one of the works best associated with him, FTP name this artist of Girl with a Pearl Earring.
Fine Arts