Question: name of bird that ate prometheus's liver
[{'answer': 'eagle', 'provenance': [{'wikipedia_id': '23250', 'title': 'Prometheus', 'start_paragraph_id': 2, 'start_character': 309, 'end_paragraph_id': 2, 'end_character': 314, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23250', 'title': 'Prometheus', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 577, 'bleu_score': 0.9399161112409831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12967477898137030214}, 'section': 'Section::::Abstract.'}]}]