Question: what kind of virus was the bubonic plague
[{'answer': 'bacterial'}, {'provenance': [{'wikipedia_id': '16392927', 'title': 'Bubonic plague', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 368, 'bleu_score': 0.8562187866406611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9140918127676433041}, 'section': 'Section::::Abstract.'}]}]