Question: which region does the urinary bladder lie in
[{'answer': 'the base of the pelvis', 'provenance': [{'wikipedia_id': '32259', 'title': 'Urinary bladder', 'start_paragraph_id': 3, 'start_character': 62, 'end_paragraph_id': 3, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Structure.\n'}]}, {'provenance': [{'wikipedia_id': '32259', 'title': 'Urinary bladder', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 316, 'bleu_score': 0.9036816878108531, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4396948935895196313}, 'section': 'Section::::Structure.\n'}]}]