Question: which us region has the highest poverty rate
[{'answer': 'Mississippi', 'provenance': [{'wikipedia_id': '14704253', 'title': 'List of U.S. states and territories by poverty rate', 'start_paragraph_id': 2, 'start_character': 156, 'end_paragraph_id': 2, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]