Question: who wrote the line a thing of beauty is a joy forever
[{'answer': 'John Keats', 'provenance': [{'wikipedia_id': '2180722', 'title': 'Endymion (poem)', 'start_paragraph_id': 1, 'start_character': 22, 'end_paragraph_id': 1, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2180722', 'title': 'Endymion (poem)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 468, 'bleu_score': 0.8671715856009861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1989040956576084623}, 'section': 'Section::::Abstract.'}]}]