Question: who has written the book war and peace
[{'answer': 'Leo Tolstoy', 'provenance': [{'wikipedia_id': '155311', 'title': 'War and Peace', 'start_paragraph_id': 1, 'start_character': 84, 'end_paragraph_id': 1, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '155311', 'title': 'War and Peace', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 0.5366804149051381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16210314972936830854}, 'section': 'Section::::Abstract.'}]}]