Question: when was germany formed into a single country
[{'answer': '18 January 1871', 'provenance': [{'wikipedia_id': '1070016', 'title': 'Unification of Germany', 'start_paragraph_id': 1, 'start_character': 114, 'end_paragraph_id': 1, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1070016', 'title': 'Unification of Germany', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 881, 'bleu_score': 0.9004616327406031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6823428329875517537}, 'section': 'Section::::Abstract.'}]}]