Question: how strong was hurricane katrina when it hit
[{'answer': 'a Category 3 hurricane', 'provenance': [{'wikipedia_id': '2569378', 'title': 'Hurricane Katrina', 'start_paragraph_id': 2, 'start_character': 678, 'end_paragraph_id': 2, 'end_character': 700, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2569378', 'title': 'Hurricane Katrina', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 888, 'bleu_score': 0.9244382127548421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16393056683579626290}, 'section': 'Section::::Abstract.'}]}]