Question: when did the united nations came 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.'}]}, {'provenance': [{'wikipedia_id': '31769', 'title': 'United Nations', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1031, 'bleu_score': 0.5161090515258481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 112123825444600672}, 'section': 'Section::::Abstract.'}]}]