Question: what is the national bird of the united states
[{'answer': 'The bald eagle', 'provenance': [{'wikipedia_id': '4401', 'title': 'Bald eagle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4401', 'title': 'Bald eagle', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 512, 'bleu_score': 0.978138775770484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2880676158906544778}, 'section': 'Section::::Abstract.'}]}]