input: Background: In 1507, he was ordained to the priesthood, and in 1508, von Staupitz, first dean of the newly founded University of Wittenberg, sent for Luther, to teach theology. He received a bachelor's degree in Biblical studies on 9 March 1508, and another bachelor's degree in the Sentences by Peter Lombard in 1509.
  Question: What did Luther's degree in 1509 concern?
  Answer:<extra_id_0>.
output: <extra_id_0> Sentences by Peter Lombard<extra_id_1>