Question: when did the first episode of dragon ball air
[{'answer': 'February 26 , 1986', 'provenance': [{'wikipedia_id': '11091078', 'title': 'Dragon Ball', 'start_paragraph_id': 28, 'start_character': 169, 'end_paragraph_id': 28, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Media.:Anime.:Direct adaptations of manga and Toriyama\'s plot outlines.:"Dragon Ball".\n'}]}, {'provenance': [{'wikipedia_id': '11091078', 'title': 'Dragon Ball', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 237, 'bleu_score': 0.8846179250781581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15114670397317690356}, 'section': 'Section::::Media.:Anime.:Direct adaptations of manga and Toriyama\'s plot outlines.:"Dragon Ball".\n'}]}]