Question: which state has the largest land area in the southwest region
[{'answer': 'Phoenix', 'provenance': [{'wikipedia_id': '179571', 'title': 'Southwestern United States', 'start_paragraph_id': 1, 'start_character': 589, 'end_paragraph_id': 1, 'end_character': 596, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]