Question: groundnut is mostly grown in which part of nigeria
[{'answer': 'northern Nigeria', 'provenance': [{'wikipedia_id': '42806389', 'title': 'Groundnut pyramids', 'start_paragraph_id': 1, 'start_character': 102, 'end_paragraph_id': 1, 'end_character': 118, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42806389', 'title': 'Groundnut pyramids', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 495, 'bleu_score': 0.9748377259086851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17741638526309425169}, 'section': 'Section::::Abstract.'}]}]