Question: how many books are there for my hero academia
[{'answer': '20', 'provenance': [{'wikipedia_id': '49144012', 'title': 'List of My Hero Academia chapters', 'start_paragraph_id': 1, 'start_character': 171, 'end_paragraph_id': 1, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]