Question: when did china become a member of the security council
[{'answer': '24 October 1945', 'provenance': [{'wikipedia_id': '325572', 'title': 'China and the United Nations', 'start_paragraph_id': 19, 'start_character': 199, 'end_paragraph_id': 19, 'end_character': 214, 'bleu_score': 1.0, 'section': 'Section::::History.:Republic of China in the United Nations (1945–1971).\n'}]}]