Question: when did sao tome and principe gain independence
[{'answer': 'July 12 , 1975', 'provenance': [{'wikipedia_id': '27259', 'title': 'History of São Tomé and Príncipe', 'start_paragraph_id': 10, 'start_character': 702, 'end_paragraph_id': 10, 'end_character': 716, 'bleu_score': 1.0, 'section': 'Section::::Movement towards independence.\n'}]}, {'provenance': [{'wikipedia_id': '27259', 'title': 'History of São Tomé and Príncipe', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 798, 'bleu_score': 0.984188478234951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4536403955536109246}, 'section': 'Section::::Movement towards independence.\n'}]}]