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.
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Question: This organ produces a tetrapeptide, which bonds to macrophage receptors, and is known as tuftsin. The sinusoids of one portion of this organ contain blood and a reserve of monocytes which can be utilized in the case of hemorrhagic shock. The other major portion of this organ contains Malphigian corpsules and synthesizes antibodies. Located in the abdominal region and consisting of red and white pulp, for 10 points, name this organ part of the lymphatic system that helps to filter and clean the blood.

Answer: Social Science

Question: The aristocratic Fourteen Families survived the crash of this country's indigo industry by slavedriving their way into coffee-producing wealth, while its natoional tradition venerates the Pipil warriors who repelled Pedro de Alvorado. Occult enthusiast Maximiliano Hernandez Martinez responded to Farabundo Marti's 1932 peasant uprising in this country by initiating a brutally systematic mass murder of its citizens known as "the slaughter, or la matanza. Roberto D'Aubuisson, the founder of this country's ARENA party, was revealed to be incurably genocidal and implicated in the deaths of Rutilio Grande and Archbishop Oscar Romero. Tensions over the border near the Gulf of Fonseca were ignited by a 1970 FIFA qualifying match, leading this country and Honduras to fight the soccer war. For 10 points, name this Central American country with capital at San Salvador.

Answer: History

Question: One opera by this composer ends with Death departing and Satyavan coming back to life. In addition to Savitri, he composed the opera At the Boar's Head. Orchestral works by this composer include the Thomas Hardy inspired tone poem Egdon Heath, and a work named for the school where he taught, St. Paul's Suite. The movements "Song of the Blacksmith" and "Fantasia on the Dargason" conclude his Second Suite in F for Military Band. His best-known work was inspired by astrology and contains seven movements, the first of which features an ostinato rhythm in 5/4, and is entitled "Mars, the Bringer of War. " For 10 points, name this English composer of The Planets.

Answer:
Fine Arts