Question: who said law is the command of sovereign
[{'answer': 'John Austin', 'provenance': [{'wikipedia_id': '1407832', 'title': 'The Concept of Law', 'start_paragraph_id': 14, 'start_character': 69, 'end_paragraph_id': 14, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Austin\'s "command theory".\n'}]}, {'provenance': [{'wikipedia_id': '1407832', 'title': 'The Concept of Law', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 106, 'bleu_score': 0.8914703664390791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8752848215963126917}, 'section': 'Section::::Background.\n'}]}]