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.

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.
Science

Fred Hampton and Mark Clark were two Black Panthers shot to death in this city while they were asleep. Anthony Abbate (read: A BODY) violently beat the bartender Karolina Obrycka in this city after she refused to continue serving him. Jon Burge was convicted of perjury in this city in 2010, which he committed in the course of civil suits against him for the torture he ordered as Commander of the Area 2 violent crimes unit in the 1980s. In 1886, seven anarchists were sentenced to death in this city following an incident when a pipe bomb explosion caused a line of policemen to fire into a crowd of striking workers in Haymarket Square in this city. For ten points, what is this city notorious for police violence, particularly the violence ordered by Mayor Richard J. Daley during the 1968 Democratic National Convention
History

One writer from this country wrote about Salie and her brother Madicke in The Belly of the Atlantic, and another writer from this country wrote Scarlet Song as well as a novel written in the form of a letter from Ramatoulaye to Aissatou, So Long a Letter. Aside from Fatou Diome and Mariama B, authors from this country include one who wrote Xala, which he later adapted into a film, as well as a novel about a railroad strike, God's Bits of Wood. That author, Ousmane Sembne, is not as famous as a poet from this country, who, along with Aim Csaire, created the concept of Ngritude. For 10 points, name this country which was home to Lopold Senghor.

Literature