Question: how many time zones does the united states have
[{'answer': 'nine', 'provenance': [{'wikipedia_id': '579351', 'title': 'Time in the United States', 'start_paragraph_id': 1, 'start_character': 51, 'end_paragraph_id': 1, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '579351', 'title': 'Time in the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 765, 'bleu_score': 0.953519567724004, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7022081116194769673}, 'section': 'Section::::Abstract.'}]}]