Question: how many episodes does ncis season 15 have
[{'answer': '24', 'provenance': [{'wikipedia_id': '49947058', 'title': 'NCIS (season 15)', 'start_paragraph_id': 1, 'start_character': 422, 'end_paragraph_id': 1, 'end_character': 424, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]