Question: when did china become a member of the united nations
[{'answer': 'October 24 , 1945'}, {'provenance': [{'wikipedia_id': '325572', 'title': 'China and the United Nations', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 214, 'bleu_score': 0.8909603231103981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15362730331019388551}, 'section': 'Section::::History.:Republic of China in the United Nations (1945–1971).\n'}]}]