Question: where do historians believe the black death originated
[{'answer': 'Central Asia', 'provenance': [{'wikipedia_id': '20155274', 'title': 'Black Death migration', 'start_paragraph_id': 2, 'start_character': 117, 'end_paragraph_id': 2, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20155274', 'title': 'Black Death migration', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 599, 'bleu_score': 0.9804854598160591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2757933428158975625}, 'section': 'Section::::Abstract.'}]}]