For 10 points, name this school of Buddhism contrasted with Mahayana.
Clergy of this religious branch go on a yearly retreat called Vassa during the wet season. One scripture from this religious branch tells of a king who gives away a rain-bringing white elephant and his two children. That story is found in part of the Khuddaka Nikaya. This religious branch's path to salvation is described through seven stages of purification in the Visuddhimagga, which was written by Buddhaghosa. The vipassana movement includes schools from this branch that emphasize the three marks of existence. Groups including Vinaya and Abhidhamma are found in this branch's central collection of texts, which constitute the Tipitaka, or Pali Canon. For 10 points, name this school of Buddhism contrasted with Mahayana.
Clergy of this religious branch go on a yearly retreat called Vassa during the wet season.
Theravada Buddhism [prompt on "Hinayana" or "Buddhism"]