Question: who said politics is the struggle for power
[{'answer': 'Hans Morgenthau', 'provenance': [{'wikipedia_id': '13054621', 'title': 'Politics Among Nations', 'start_paragraph_id': 1, 'start_character': 88, 'end_paragraph_id': 1, 'end_character': 103, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13054621', 'title': 'Politics Among Nations', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 121, 'bleu_score': 0.9021315316859231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2595146916966636039}, 'section': 'Section::::Abstract.'}]}]