Question: how many chapters are in the tokyo ghoul manga
[{'answer': '14', 'provenance': [{'wikipedia_id': '45039553', 'title': 'List of Tokyo Ghoul chapters', 'start_paragraph_id': 2, 'start_character': 132, 'end_paragraph_id': 2, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]