Question: the blue field on the us flag is called
[{'answer': 'union', 'provenance': [{'wikipedia_id': '11447', 'title': 'Flag of the United States', 'start_paragraph_id': 1, 'start_character': 305, 'end_paragraph_id': 1, 'end_character': 310, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11447', 'title': 'Flag of the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 813, 'bleu_score': 0.9727108480043881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11906517654190264943}, 'section': 'Section::::Abstract.'}]}]