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]: In his later work he distinguished between value that is invoked when an interpersonal exchange occurs and value as denoting the qualitative mental evaluation of elements. Using these definitions, he created an algebra of social exchange in his Sociological Studies. In his earlier work he argued that information processing is guided by a need for equilibrium, which is restored by either assimilating new information into old patterns, or altering the old pattern to accommodate the new information. Known for his belief in instinctual "schemas" of behavior at birth, he sought to understand the formation of knowledge in terms of "genetic epistemology. " FTP, name this French developmental psychologist, best known for positing four stages of development beginning with the sensorimotor.
[A]: Social Science

[Q]: The Clausius-Clapeyron equation assumes the change in this to be zero. Because this quantity is most useful when the substance in question is both isothermal and isobaric, a different quantity is used for explosive substances. An equation partially due to the namesake of this quantity gives the temperature dependence of this quantity for an ideal gas. A zero change in this quantity for a system implies that the system is in equilibrium, but a negative value for this quantity implies that a reaction is spontaneous. One may derive this by utilizing the Legendre transform on the internal energy of a system. For ten points, name this state function named for its American inventor, which measures the maximum amount of work attainable from a system, defined as enthalpy minus the product of temperature and entropy.
[A]: Science

[Q]: According to Turan's Theorem, one of these entities is necessarily formed if four times the number of edges in a graph is greater than the number of vertices squared. Every two-coloring on a complete 6-graph forms two monochrome examples of these entities. Three lines concur in one of these figures if the conditions for Ceva's ["CHAY-va's] Theorem are met, and the areas of these figures can be found using (*) Heron's formula. The laws of sines and cosines hold true for these shapes, whose areas are equal to base times height over two. For ten points, name these three-sided figures, which come in equilateral and isosceles varieties.
[A]:
Science