Question: who wrote the book a walk in the woods
[{'answer': 'Bill Bryson', 'provenance': [{'wikipedia_id': '518097', 'title': 'A Walk in the Woods (book)', 'start_paragraph_id': 1, 'start_character': 117, 'end_paragraph_id': 1, 'end_character': 128, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]