Question: who wrote the book a theory of justice
[{'answer': 'John Rawls', 'provenance': [{'wikipedia_id': '243665', 'title': 'A Theory of Justice', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '243665', 'title': 'A Theory of Justice', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 918, 'bleu_score': 0.63562041972862, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15993788301834463072}, 'section': 'Section::::Abstract.'}]}]