Question: how long did the tv show er run
[{'answer': '15 seasons', 'provenance': [{'wikipedia_id': '177153', 'title': 'ER (TV series)', 'start_paragraph_id': 1, 'start_character': 210, 'end_paragraph_id': 1, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '177153', 'title': 'ER (TV series)', 'start_paragraph_id': 1, 'start_character': 26, 'end_paragraph_id': 1, 'end_character': 1016, 'bleu_score': 0.832844940847093, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17925741300639873338}, 'section': 'Section::::Abstract.'}]}]