Question: who was president of the united states when katrina hit louisiana
[{'answer': 'President George W. Bush', 'provenance': [{'wikipedia_id': '2569378', 'title': 'Hurricane Katrina', 'start_paragraph_id': 5, 'start_character': 454, 'end_paragraph_id': 5, 'end_character': 478, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2569378', 'title': 'Hurricane Katrina', 'start_paragraph_id': 5, 'start_character': 57, 'end_paragraph_id': 5, 'end_character': 735, 'bleu_score': 0.821955336115278, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13428964684755193896}, 'section': 'Section::::Abstract.'}]}]