Question: who plays the devil in o brother where art thou
[{'answer': 'Daniel von Bargen', 'provenance': [{'wikipedia_id': '22216', 'title': 'O Brother, Where Art Thou?', 'start_paragraph_id': 21, 'start_character': 12, 'end_paragraph_id': 21, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]