Question: how many series are there of true blood
[{'answer': 'seven seasons', 'provenance': [{'wikipedia_id': '18624945', 'title': 'True Blood', 'start_paragraph_id': 4, 'start_character': 272, 'end_paragraph_id': 4, 'end_character': 285, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18624945', 'title': 'True Blood', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 446, 'bleu_score': 0.972782728923768, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15744440774249060160}, 'section': 'Section::::Abstract.'}]}]