Question: what is the tallest mountain east of the mississippi river
[{'answer': 'Mount Mitchell', 'provenance': [{'wikipedia_id': '207206', 'title': 'Mount Mitchell', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '207206', 'title': 'Mount Mitchell', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 402, 'bleu_score': 0.797834615521623, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4710418579176108207}, 'section': 'Section::::Abstract.'}]}]