Question: what is the largest tree in the united states
[{'answer': 'General Sherman', 'provenance': [{'wikipedia_id': '292914', 'title': 'General Sherman (tree)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'a giant sequoia', 'provenance': [{'wikipedia_id': '292914', 'title': 'General Sherman (tree)', 'start_paragraph_id': 1, 'start_character': 19, 'end_paragraph_id': 1, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '292914', 'title': 'General Sherman (tree)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 240, 'bleu_score': 0.950578622812921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14262778988745936502}, 'section': 'Section::::Abstract.'}]}]