Question: how many districts are there in the us
[{'answer': '94', 'provenance': [{'wikipedia_id': '157553', 'title': 'United States federal judicial district', 'start_paragraph_id': 1, 'start_character': 119, 'end_paragraph_id': 1, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '157553', 'title': 'United States federal judicial district', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 471, 'bleu_score': 0.8993500463131121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 544225744995802490}, 'section': 'Section::::Abstract.'}]}]