Question: who is responsible for spreading agriculture and iron smelting in sub saharan africa
[{'answer': 'Bantu', 'provenance': [{'wikipedia_id': '20255436', 'title': 'Iron metallurgy in Africa', 'start_paragraph_id': 3, 'start_character': 153, 'end_paragraph_id': 3, 'end_character': 158, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20255436', 'title': 'Iron metallurgy in Africa', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 256, 'bleu_score': 0.71643010597749, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10057177974099732939}, 'section': 'Section::::Abstract.'}]}]