Question: how many seasons are there of nurse jackie on showtime
[{'answer': '7', 'provenance': [{'wikipedia_id': '21879822', 'title': 'Nurse Jackie', 'start_paragraph_id': 6, 'start_character': 436, 'end_paragraph_id': 6, 'end_character': 437, 'bleu_score': 1.0, 'section': 'Section::::Development and production.\n'}]}]