Question: who did the democratic republic of congo gain independence from
[{'answer': '30 June 1960', 'provenance': [{'wikipedia_id': '76762', 'title': 'Democratic Republic of the Congo', 'start_paragraph_id': 4, 'start_character': 43, 'end_paragraph_id': 4, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]