Question: who played the main character in sling blade
[{'answer': 'Billy Bob Thornton', 'provenance': [{'wikipedia_id': '171522', 'title': 'Sling Blade', 'start_paragraph_id': 1, 'start_character': 66, 'end_paragraph_id': 1, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '171522', 'title': 'Sling Blade', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 590, 'bleu_score': 0.8265696640515331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18373752699462088970}, 'section': 'Section::::Abstract.'}]}]