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.

[EX Q]: 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.
[EX A]: Social Science

[EX Q]: To isolate volatile compounds from nonvolatile impurities, the steam form of this process is used when the compounds decompose at standard temperatures and pressures. Two miscible liquids are heated under a Liebig condenser to increase the concentration of the liquid with the lower boiling point in a common type of this process. FTP, name this separation method by boiling point, whose fractional variety yields cosmetics from petroleum and alcohol from a water mixture.
[EX A]: Science

[EX Q]: theory which accurately predicts this quantity at low temperatures is based on the assumption that vibrational modes exhibit a linear relationship at longer wavelengths; that model gives this quantity as proportional to the cube of temperature below a namesake threshold. The difference between the molar forms of this quantity at constant pressure and at constant temperature give the ideal gas constant, while calculations by Dulong and Petit showed that the dimensionless form of this quantity is limits to 3 at high temperatures. For 10 points, identify this quantity which describes the rate of change in the thermal energy of a system with respect to temperature, and which is 4. 18 Joules per gram per Kelvin for water.
[EX A]:
Science