Question: what was the host animal of the black plague
[{'answer': 'the fleas on rats', 'provenance': [{'wikipedia_id': '16392927', 'title': 'Bubonic plague', 'start_paragraph_id': 34, 'start_character': 1403, 'end_paragraph_id': 34, 'end_character': 1420, 'bleu_score': 1.0, 'section': 'Section::::History.:Second pandemic.\n'}]}, {'provenance': [{'wikipedia_id': '16392927', 'title': 'Bubonic plague', 'start_paragraph_id': 34, 'start_character': 0, 'end_paragraph_id': 34, 'end_character': 1573, 'bleu_score': 0.972737489917416, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15355591650906905394}, 'section': 'Section::::History.:Second pandemic.\n'}]}]