Question: when did the united nations come into existence
[{'answer': '24 October 1945', 'provenance': [{'wikipedia_id': '31769', 'title': 'United Nations', 'start_paragraph_id': 2, 'start_character': 303, 'end_paragraph_id': 2, 'end_character': 318, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]