Question: where is the medulla located in the kidney
[{'answer': 'the innermost part', 'provenance': [{'wikipedia_id': '598336', 'title': 'Renal medulla', 'start_paragraph_id': 1, 'start_character': 21, 'end_paragraph_id': 1, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '598336', 'title': 'Renal medulla', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 849, 'bleu_score': 0.985964042079227, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11025008353286110990}, 'section': 'Section::::Abstract.'}]}]