Question: when does ray lose his legs on er
[{'answer': '23', 'provenance': [{'wikipedia_id': '17356205', 'title': 'ER (season 13)', 'start_paragraph_id': 1, 'start_character': 157, 'end_paragraph_id': 1, 'end_character': 159, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]