Question: who wrote the national anthem of the united states of america
[{'answer': 'Francis Scott Key', 'provenance': [{'wikipedia_id': '31064', 'title': 'The Star-Spangled Banner', 'start_paragraph_id': 1, 'start_character': 208, 'end_paragraph_id': 1, 'end_character': 225, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31064', 'title': 'The Star-Spangled Banner', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 528, 'bleu_score': 0.795037381994936, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1328678691450191007}, 'section': 'Section::::Abstract.'}]}]