Question: which state has produced the most us presidents
[{'answer': 'Virginia', 'provenance': [{'wikipedia_id': '38282506', 'title': 'List of Presidents of the United States by home state', 'start_paragraph_id': 4, 'start_character': 9, 'end_paragraph_id': 4, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Birth places.\n'}]}]