Question: what are the main sectors of the us economy
[{'answer': 'service', 'provenance': [{'wikipedia_id': '32022', 'title': 'Economy of the United States', 'start_paragraph_id': 2, 'start_character': 951, 'end_paragraph_id': 2, 'end_character': 958, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'manufacturing', 'provenance': [{'wikipedia_id': '32022', 'title': 'Economy of the United States', 'start_paragraph_id': 2, 'start_character': 718, 'end_paragraph_id': 2, 'end_character': 731, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'agriculture', 'provenance': [{'wikipedia_id': '32022', 'title': 'Economy of the United States', 'start_paragraph_id': 48, 'start_character': 305, 'end_paragraph_id': 48, 'end_character': 316, 'bleu_score': 1.0, 'section': 'Section::::Employment.:Unemployment.\n'}]}, {'provenance': [{'wikipedia_id': '32022', 'title': 'Economy of the United States', 'start_paragraph_id': 51, 'start_character': 0, 'end_paragraph_id': 51, 'end_character': 151, 'bleu_score': 0.9214109120166031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2493814339084725075}, 'section': 'Section::::Employment.:Employment by sector.\n'}]}]