Question: who created the three emperors' league in 1872
[{'answer': 'German Empire'}, {'answer': 'Russian Empire'}, {'answer': 'Austria - Hungary', 'provenance': [{'wikipedia_id': '487318', 'title': 'League of the Three Emperors', 'start_paragraph_id': 15, 'start_character': 136, 'end_paragraph_id': 15, 'end_character': 155, 'bleu_score': 1.0, 'section': 'Section::::Revival (1881–1887).\n'}]}, {'provenance': [{'wikipedia_id': '487318', 'title': 'League of the Three Emperors', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1187, 'bleu_score': 0.886072839083142, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11736193035101145846}, 'section': 'Section::::Abstract.'}]}]