Question: factors that led to the decline of the great zimbabwe state
[{'answer': 'political instability', 'provenance': [{'wikipedia_id': '177952', 'title': 'Great Zimbabwe', 'start_paragraph_id': 24, 'start_character': 188, 'end_paragraph_id': 24, 'end_character': 209, 'bleu_score': 1.0, 'section': 'Section::::Description.:Decline.\n'}]}, {'answer': 'a decline in trade compared to sites further north'}, {'answer': 'famine and water shortages induced by climatic change'}, {'answer': 'the exhaustion of the gold mines'}, {'provenance': [{'wikipedia_id': '177952', 'title': 'Great Zimbabwe', 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 650, 'bleu_score': 0.9815648442794911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7265541069244956801}, 'section': 'Section::::Description.:Decline.\n'}]}]