Question: what was the disaster in the book of eli
[{'answer': 'a nuclear apocalypse', 'provenance': [{'wikipedia_id': '20450767', 'title': 'The Book of Eli', 'start_paragraph_id': 4, 'start_character': 19, 'end_paragraph_id': 4, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '20450767', 'title': 'The Book of Eli', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 551, 'bleu_score': 0.81613451691713, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1248912696465701370}, 'section': 'Section::::Plot.\n'}]}]