Question: who wrote leviathan detailing his ideas about a state of nature
[{'answer': 'Thomas Hobbes', 'provenance': [{'wikipedia_id': '1113705', 'title': 'Leviathan (disambiguation)', 'start_paragraph_id': 8, 'start_character': 78, 'end_paragraph_id': 8, 'end_character': 91, 'bleu_score': 1.0, 'section': 'Section::::Entertainment and media.:Books.\n'}]}]