Question: when did germany become a member of the un
[{'answer': '18 September 1973', 'provenance': [{'wikipedia_id': '33160690', 'title': 'Germany and the United Nations', 'start_paragraph_id': 2, 'start_character': 75, 'end_paragraph_id': 2, 'end_character': 92, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]