Question: who wrote about the idyllic 'isle of innisfree'
[{'answer': 'William Butler Yeats', 'provenance': [{'wikipedia_id': '13455878', 'title': 'Lake Isle of Innisfree', 'start_paragraph_id': 1, 'start_character': 90, 'end_paragraph_id': 1, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13455878', 'title': 'Lake Isle of Innisfree', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 309, 'bleu_score': 0.962600167205617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16686385296421066460}, 'section': 'Section::::Abstract.'}]}]