Question: who followed the policy of blood and iron
[{'answer': 'Bismarck', 'provenance': [{'wikipedia_id': '17892925', 'title': 'Blood and Iron (speech)', 'start_paragraph_id': 1, 'start_character': 89, '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': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1161, 'bleu_score': 0.9702931489955061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11741391146363499806}, 'section': 'Section::::Abstract.'}]}]