Question: which organ in the urinary system temporarily stores urine
[{'answer': 'bladder', 'provenance': [{'wikipedia_id': '55927', 'title': 'Urinary system', 'start_paragraph_id': 1, 'start_character': 103, 'end_paragraph_id': 1, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55927', 'title': 'Urinary system', 'start_paragraph_id': 1, 'start_character': 67, 'end_paragraph_id': 1, 'end_character': 942, 'bleu_score': 0.8075320385029071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1815833934354931569}, 'section': 'Section::::Abstract.'}]}]