Question: how many series of dance moms are there
[{'answer': '7', 'provenance': [{'wikipedia_id': '32562697', 'title': 'Dance Moms', 'start_paragraph_id': 1, 'start_character': 446, 'end_paragraph_id': 1, 'end_character': 447, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]