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.

Occlusion by this astronomical body of Saggitarius Tr-180 suggests that the rate of sublimation from its surface has doubled. That sublimation may have helped to create evaporite deposits such as the Akupara and Rem maculae, which cover a surface of beta-hexagonal ice surrounding the Plain of Abatus. Its changing albedo is believed to couple with gravitational diapirism to produce the cavi of its unique terrane of Bubeme. Perhaps the most interesting surface features occur in its equatorial region, which contains fault-block mountain ranges bounded by the Ho and Lo sulci, indicating a tectonic past, and the geyser plumes Hili and Mahilani, which contribute to its thin atmosphere. FTP, name this moon of Neptune best known for its cryovolcanic eruptions and its retrograde orbit.
Science

Having fought in the Chaco War, this man served as commander-in-chief of his nation's armed forces from 1951-54, and in 1954 he ousted President Frederico Chavez. Nicknamed Colonel Trunk, he essentially ruled as a totalitarian, and membership in his Colorado Party was a requirement for most jobs. His country became notorious for its illegal trade, drug trafficing, and harboring of NAZI war criminals, and in 1989 he was ousted by so-called "traditionalists" led by Andres Rodriguez. FTP, who was this son of a German immigrant, the long-time president of Paraguay
History

Tri-phenyl-phosphine and diethyl azo-di-carboxylate are used to transform this class of organic compounds into other compounds such as esters and various types of ethers via the Mitsunobu reaction. An ester can also be formed from a carboxylic acid and one of these with the help of an acidic catalyst in a process known as Fischer esterification, and they must be made into good leaving groups, often with tosylate or mesylate, before they can undergo nucleophilic substitution. For 10 points, identify this class of organic compounds, represented by the general formula R-OH.

Science