Question: how many star are in the usa flag
[{'answer': '50', 'provenance': [{'wikipedia_id': '11447', 'title': 'Flag of the United States', 'start_paragraph_id': 1, 'start_character': 481, 'end_paragraph_id': 1, 'end_character': 483, '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': 18098993891339628275}, 'section': 'Section::::Abstract.'}]}]