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]: 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.
[A]: Social Science

[Q]: One reaction to prepare these compounds adds diazomethylphosphonate esters to aldehydes under basic catalysis and generates vinyl-diazo intermediates. Along with aldehydes, these compounds are the degradation products of alpha, beta-epoxy tosylhydrazones in the Eschenmoser fragmentation. A coupling involving both palladium and copper catalysis, in which these compounds react with aryl halides, is the Sonogashira reaction. These compounds react with azides to form triazole rings in a well-known click-chemistry reaction, and terminal ones can be deprotonated by sodium amide. They are reduced to cis-alkenes by the poisoned Lindlar catalyst. This functional group is composed of two sp-hybridized carbons. For 10 points, name this functional group consisting of a carbon-carbon triple bond.
[A]: Science

[Q]: quantity is constant in the body frame of an object, but has a time dependence in the space frame given by the position times this quantity in the body frame times the inverse of the position. For a random object, finding this quantity involves taking the integral of an outer product. Half of the time derivative of this quantity is equal to the scalar virial. This quantity provides the coefficients of the axes in Poinsot's ellipsoid. Euler's equations has this quantity in a dot product with the time derivative of angular velocity. The products of this 2nd order symmetric tensor form the non-diagonal term in the tensor matrix while the principal ones of this tensor form the diagonal in the tensor matrix. Given this quantity for one axis, one can find it for another axis with the Parallel Axis theorem. For 10 points, name this quantity that for a hoop is one-half times mass times the radius of gyration.
[A]:
Science