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]: One description of the court of this leader is a History written in Greek by Priscus of Panium. A policy of appeasement was unsuccessfully used by Theodosius II to try and stop this ruler from invading his empire. This man fought a battle against forces under Theodoric I and Aetius on the Catalaunian Plains. This loser of the Battle of Chalons became sole ruler of his people after he arranged the murder of his brother Bleda. For 10 points, name this ruler who gained the title ""Scourge of God"" for his invasions into the Roman Empire while leader of the Huns.
[EX A]: History

[EX Q]: A maximum independent set for this data structure can be found in linear time by adding alternating levels. In this structure, any two vertices or nodes must be connected by a single simple path, and thus it is connected and acyclic. By using (*) union-find with disjoint sets, one type of this structure containing all the vertices of a connected graph can be constructed. One variety of this data structure can be used to easily implement a binary search. This structure also comes in red-black and self-balancing-binary varieties. For 10 points, identify this data structure from computer science, a hierarchical graph in which "leaf" nodes ultimately flow from a "root" node.
[EX A]: Science

[EX Q]: It is thought with communion with this figure can be achieved through Haoma. He is unequivocally linked with atar, while his consort is linked with aban, principles embodied in shrines to this figure known as Fire Temples. He is the defender of Asha, and the model for the doctrine of good thoughts, good words, good deeds as iterated in the Gathas. Zurvanists consider this opposer of the daevas to be no greater than his rival, but he is clearly depicted better than Angra Mainyu in the Zend Avesta. FTP, identify this supreme deity of Zoroastrianism, the leader of the angelic Ahuras.
[EX A]:
Social Science