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 Fraunhofer lines of the Sun's electromagnetic spectrum contain a D-line, sometimes known as a ""doublet,"" produced by transitions in this element's family but traditionally named after this element. This metal is currently made using the Downs Cell. When it is used as a coolant in nuclear reactors, the radioactive 24 isotope of this element is formed. It produces a bright (*) yellow flame when heated. This is the second-lightest alkali metal after lithium. For 10 points, identify this metal whose chloride is table salt.
[A]: Science

[Q]: In this work, a definition of justice as "what is good for the stronger" is given by Thrasymachus. In this work, a story about the killer of King Candaules of Lydia is used to describe how people are just out of necessity. That story in this work tells of the [*] "Ring of Gyges." This work describes chained prisoners who watch shadows pass before them. This work combines ideas about the "divided line" and the sun into its "Allegory of the Cave." For 10 points, name this work that proposes a government ruled by philosopher kings, a dialogue on government by Plato.
[A]: Literature

[Q]: These objects are often underlain by Rothlisberger or Nye channels. In one form, their movement is almost entirely controlled by Glen's Flow Law. Warm ones can also move by enhanced creep, ploughing, and regelation, and both types can experience hydraulic jacking. Many of these objects experience quasi-regular surge cycles, where their movement speed can increase a thousand-fold. These objects create a range of characteristic landforms, including kames, eskers and drumlins. For 10 points, name this class of objects found in mountainous and polar regions around the world, made entirely of ice.
[A]:
Science