Question: what kind of epithelium lines the urinary bladder
[{'answer': 'Transitional epithelium', 'provenance': [{'wikipedia_id': '1645923', 'title': 'Transitional epithelium', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]