Question: who adopted the policy of blood and iron
[{'answer': 'Otto von Bismarck', 'provenance': [{'wikipedia_id': '17892925', 'title': 'Blood and Iron (speech)', 'start_paragraph_id': 1, 'start_character': 80, 'end_paragraph_id': 1, 'end_character': 97, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '17892925', 'title': 'Blood and Iron (speech)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 365, 'bleu_score': 0.9699161750394991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12821045602066278965}, 'section': 'Section::::Abstract.'}]}]