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]: The earliest discovered writings on these were in the Hittite language and were authored by Kikkuli of Mitanni, while Gryson, an expert on these, helped Xenophon to write two treatises on the subject. Tupac Amaru II and Francois Ravaillac were both executed using four of these, and one of these named Incitatus was legendarily appointed as a Roman senator by Caligula. The Avars brought an invention that eased their use to Europe, and huge masses of these were instrumental in saving the French army at Eylau. Many cities were named after of these owned by Alexander the Great, Bucephalus. For 10 points, name these animals used to transport hussars and knights.
[EX A]: Literature

[EX Q]: Ostwald ripening is a consequence of this quantity's dependence on particle size. This quantity is plotted against temperature in an Ellingham diagram, and the Margules and van Laar equations relate this quantity to the activity coefficient. Phillips and Williams modified a diagram plotting this quantity over the Faraday constant against the oxidation state, the (*) Frost diagram. The Flory-Huggins interaction parameter appears in a namesake expression giving the "partial molar" value of this quantity, also generally referred to as chemical potential. It is equivalent to the work done under constant pressure and temperature, and this quantity "of formation" is negative for thermodynamically stable compounds. For 10 points, give this thermodynamic quantity, whose change is equal to the change in enthalpy minus the product of temperature and the change in entropy, which is named after an American scientist.
[EX A]: Science

[EX Q]: The Mayan prefix ""ox"" or ""ux,"" as in the place-name ""Uxmal,"" means this in English. A defining feature of Semitic languages is that every word is formed from this number of consonantal roots. In German and Latin, this is the number of grammatical genders. In Mandarin and in Japanese, this number is ""san. "" American legal writing preserves an outdated term for quantities that have been multiplied by this number, ""trebled. "" For 10 points, give this number, which in Portuguese and Spanish is ""tres. ""
[EX A]:
Social Science