Question: when the nile river flooded what did it leave behind
[{'answer': 'silt', 'provenance': [{'wikipedia_id': '5839243', 'title': 'Flooding of the Nile', 'start_paragraph_id': 12, 'start_character': 394, 'end_paragraph_id': 12, 'end_character': 398, 'bleu_score': 1.0, 'section': 'Section::::Agriculture.:Basin irrigation.\n'}]}, {'provenance': [{'wikipedia_id': '5839243', 'title': 'Flooding of the Nile', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 707, 'bleu_score': 0.9829771687435411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10160784422647356020}, 'section': 'Section::::Agriculture.:Basin irrigation.\n'}]}]