Question: the country with the largest population in sub-saharan africa
[{'answer': 'Nigeria', 'provenance': [{'wikipedia_id': '6020545', 'title': 'Demographics of Africa', 'start_paragraph_id': 3, 'start_character': 37, 'end_paragraph_id': 3, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]