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: In the aria Mal reggendo, one character in this opera relates how a strange voice stopped his hand from killing his opponent in a duel in Act 1. The arias Di due figli and Abbietta zingara are used by one character to narrate a ghost story to a gathering which is dispersed by the ringing of a bell. In Prima che d'altri vivere, the protagonist bids farewell to his lover after she poisons herself. After the first act in which Ferrando conjures the image of a baby burnt alive on a pyre, Chi del gitano i giorni abbella, or the Anvil Chorus, is sung by a group of gypsies. After the death of Leonora, the mother of Azucena is avenged when Count di Luna orders the execution of the title character Manrico. FTP, name this opera by Giuseppe Verdi.

Output: Fine Arts


Input: Consider Input: Ninhydrin forms a Schiff base with this chemical, resulting in a hue known as Ruhemanns purple. The Birch reduction takes place in a liquid substrate of it, the reason it is common in methamphetamine labs. The Kjeldahl method uses this molecule as an end-product to measure the amount of nitrogen in a sample, and it is oxidized in the first step of a nitric acid forming procedure, the Ostwald process. For 10 points, name this weak base found in fertilizers, formed by combining hydrogen and nitrogen in a three-to-one ratio in the Haber process.

Output: Science


Input: Consider Input: In an October, 1997 JCE article, Parquet and Lin outlined a microwave-assisted version of this procedure that creates a reagent in situ by irradiation of isatin. This reaction is analogous to hydroxylamine-mediated oxime synthesis. It is sometimes cited as only its second step, which is usually catalyzed by an alkali ethoxide or potassium hydroxide, but that second step cannot proceed without an initial hydroxone formation by the carbonyl-containing reactants. It is now rarely performed since it requires extremely dangerous heating of hydrazine in the presence of ketones or aldehydes. FTP, name this organic reduction of ketones or aldehydes to corresponding alkanes, named for German and Russian chemists.


Output: Science