Question: what human body system is the kidney in
[{'answer': 'Urinary system'}, {'answer': 'endocrine system', 'provenance': [{'wikipedia_id': '17025', 'title': 'Kidney', 'start_paragraph_id': 36, 'start_character': 288, 'end_paragraph_id': 36, 'end_character': 304, 'bleu_score': 1.0, 'section': 'Section::::Function.\n'}]}]