Question: how many collections of forensic files are there
[{'answer': '8', 'provenance': [{'wikipedia_id': '1893210', 'title': 'Forensic Files', 'start_paragraph_id': 10, 'start_character': 453, 'end_paragraph_id': 10, 'end_character': 454, 'bleu_score': 1.0, 'section': 'Section::::Broadcast run and alternative titles.\n'}]}, {'provenance': [{'wikipedia_id': '1893210', 'title': 'Forensic Files', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 266, 'bleu_score': 0.943604326170661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2936320917734607924}, 'section': 'Section::::Other media.\n'}]}]