Question: who is acknowledged as one of the very finest of 19th-century american poets
[{'answer': 'John Keats', 'provenance': [{'wikipedia_id': '16455', 'title': 'John Keats', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '16455', 'title': 'John Keats', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 319, 'bleu_score': 0.8197359985761191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11951721982074527677}, 'section': 'Section::::Abstract.'}]}]