Question: how many parts are in the sinner series
[{'answer': 'eight', 'provenance': [{'wikipedia_id': '52905986', 'title': 'The Sinner (TV series)', 'start_paragraph_id': 1, 'start_character': 378, 'end_paragraph_id': 1, 'end_character': 383, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]