Question: Luthien, who appears in Tolkien's companion to The Lord of the Rings, "The Silmarillion", has her story told to Frodo by the heir of Isildur, who was first introduced by what name?
{'answer': 'Strider at Bree', 'supporting_facts': [['Lúthien', 0], ['Lúthien', 3], ['Aragorn', 0], ['Aragorn', 2]]}