Question: how many episodes are in season 1 of dragon ball z
[{'answer': '39', 'provenance': [{'wikipedia_id': '24234271', 'title': 'List of Dragon Ball Z episodes (season 1)', 'start_paragraph_id': 2, 'start_character': 326, 'end_paragraph_id': 2, 'end_character': 328, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]