Question: star spangled banner year it became national anthem
[{'answer': '1931', 'provenance': [{'wikipedia_id': '31064', 'title': 'The Star-Spangled Banner', 'start_paragraph_id': 3, 'start_character': 215, 'end_paragraph_id': 3, 'end_character': 219, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31064', 'title': 'The Star-Spangled Banner', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 295, 'bleu_score': 0.8615894073865311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13364510370018530781}, 'section': 'Section::::Abstract.'}]}]