Question: who undermined bismarck's international policies by refusing to renew the reinsurance treaty
[{'answer': 'Kaiser Wilhelm II', 'provenance': [{'wikipedia_id': '1217139', 'title': 'Reinsurance Treaty', 'start_paragraph_id': 7, 'start_character': 623, 'end_paragraph_id': 7, 'end_character': 640, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]