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]: Seas of calcite predominate during times of low concentration of this element. The NIMS probe discovered that Ganymede has a sulfate of this element, which is also used to treat eclampsia. Its molten form is used to make metallic titanium in the Kroll process. The active site of rubisco contains a carbamylated lysine attached to an ion of this element. Its cationic form is used to stabilize the product of PCR, and it is also prevalent in certain reagents in a Schlenck equilibrium. It is found in Grignard reagents as well as coordinated to the porphyrin ring of chlorophyll. For 10 points, name this element with atomic number 12 and symbol Mg.
[A]: Science


[Q]: The largest labor movement in this country was organized by Carlos Mahecha and Maria Cano, but was crippled when a general fired into a demonstration in 1929. Jorge Eliecer Gaitan orated against the "masacre de las bananeras" and presented its Congress with the skull of a child killed by the Army. Gaitan's assassination in 1948 is regarded as the start of "La Violencia", a still-existing war in this country between liberals and conservatives. Though once ravaged by a conflict over banana workers' unions, this country is now home to a group, often described as "narcoterrorists," which kidnaps politicians. For 10 points, name this country, the home base of FARC.
[A]: History


[Q]: After his time in office, this president was then elected as a member of the House of Represenatives for 17 years. As Secretary of State, he authored the Monroe Doctrine, and thanks to the support of Henry Clay, his presidential election in 1824 was successful, though this was deemed a ""corrupt bargain"" by opponents. For 10 points, name this sixth U.S. President.
[A]:
History