Question: as a region which part of the us produces the most hydropower
[{'answer': 'Columbia River basin', 'provenance': [{'wikipedia_id': '24532465', 'title': 'Hydroelectric power in the United States', 'start_paragraph_id': 3, 'start_character': 129, 'end_paragraph_id': 3, 'end_character': 149, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24532465', 'title': 'Hydroelectric power in the United States', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 366, 'bleu_score': 0.965203995518735, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5429621184524882984}, 'section': 'Section::::Abstract.'}]}]