Given the task definition and input, reply with output. 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.

When challenged by Utgard-Loki, this mythological being could not empty a horn that was connected to the sea, nor could he defeat Old Age in a wrestling match. To rescue Loki, he defeated Geirrod with the help of the magical belt of the giantess Grid. At Ragnarok, the foot of Hrungnir was lifted off his neck by his son Magni, and he would later die from poison after killing Jormundgand. The father of Thrud with his wife Sif, this is, FTP, which thunder god of Norse mythology who often used a weapon which always returned to his hand, Mjollnir
Social Science