challenge: According to the legend of Asena, what is the origin of the Göktürk people?
  
  A. They migrated from the Western Sea and settled in the city of the Tocharians
  B. They descended from a group of warriors who conquered the Qocho mountains
  C. They were born from the union of a she-wolf and a young boy who survived a battle
  D. They were founded by a great leader named Yizhi Nishidu
  Answer: 