Question: where are the majority of sub-saharan africa's oil reserves located
[{'answer': 'offshore', 'provenance': [{'wikipedia_id': '27067', 'title': 'Sub-Saharan Africa', 'start_paragraph_id': 112, 'start_character': 453, 'end_paragraph_id': 112, 'end_character': 461, 'bleu_score': 1.0, 'section': 'Section::::Economy.:Oil and minerals.\n'}]}, {'provenance': [{'wikipedia_id': '27067', 'title': 'Sub-Saharan Africa', 'start_paragraph_id': 112, 'start_character': 0, 'end_paragraph_id': 112, 'end_character': 828, 'bleu_score': 0.7926238736262661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5138375521707248511}, 'section': 'Section::::Economy.:Oil and minerals.\n'}]}]