Question: when did the maya live in large cities with prominent stone pyramids
[{'answer': '500 BC', 'provenance': [{'wikipedia_id': '18449273', 'title': 'Maya civilization', 'start_paragraph_id': 2, 'start_character': 370, 'end_paragraph_id': 2, 'end_character': 376, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18449273', 'title': 'Maya civilization', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1670, 'bleu_score': 0.934984073437742, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8485081134678079711}, 'section': 'Section::::Abstract.'}]}]