Question: when did east germany and west germany unite
[{'answer': '1990', 'provenance': [{'wikipedia_id': '61103', 'title': 'German reunification', 'start_paragraph_id': 1, 'start_character': 47, 'end_paragraph_id': 1, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '61103', 'title': 'German reunification', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 586, 'bleu_score': 0.7127152998449391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8574935181929986527}, 'section': 'Section::::Abstract.'}]}]