Question: what is the largest national forest in the united states
[{'answer': 'Alaska', 'provenance': [{'wikipedia_id': '165263', 'title': 'List of U.S. National Forests', 'start_paragraph_id': 5, 'start_character': 235, 'end_paragraph_id': 5, 'end_character': 241, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '165263', 'title': 'List of U.S. National Forests', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 782, 'bleu_score': 0.898174704007158, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12293740580947115975}, 'section': 'Section::::Abstract.'}]}]