Question: what is the old kingdom of egypt known for
[{'answer': 'Pyramids', 'provenance': [{'wikipedia_id': '152500', 'title': 'Old Kingdom of Egypt', 'start_paragraph_id': 1, 'start_character': 121, 'end_paragraph_id': 1, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '152500', 'title': 'Old Kingdom of Egypt', 'start_paragraph_id': 1, 'start_character': 52, 'end_paragraph_id': 1, 'end_character': 641, 'bleu_score': 0.5971183454490571, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4764166138225127749}, 'section': 'Section::::Abstract.'}]}]