Question: how many series are there of the mentalist
[{'answer': 'seventh and final season'}, {'provenance': [{'wikipedia_id': '42724534', 'title': 'The Mentalist (season 7)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 192, 'bleu_score': 0.7416327246130161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3991941470362385715}, 'section': 'Section::::Abstract.'}]}]