Question: how many seasons is there of downton abbey
[{'answer': '6', 'provenance': [{'wikipedia_id': '28890581', 'title': 'Downton Abbey', 'start_paragraph_id': 1, 'start_character': 199, 'end_paragraph_id': 1, 'end_character': 200, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]