Question: leader of the first sub saharan african nation to gain independence
[{'answer': 'Ghana', 'provenance': [{'wikipedia_id': '1815296', 'title': 'Decolonisation of Africa', 'start_paragraph_id': 8, 'start_character': 51, 'end_paragraph_id': 8, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::Causes.:External causes.\n'}]}]