Question: when does ninjago season 8 come out on dvd
[{'answer': 'April 16 , 2018', 'provenance': [{'wikipedia_id': '30786015', 'title': 'Ninjago: Masters of Spinjitzu (TV series)', 'start_paragraph_id': 163, 'start_character': 128, 'end_paragraph_id': 163, 'end_character': 145, 'bleu_score': 1.0, 'section': 'Section::::Broadcast and release.\n'}]}, {'provenance': [{'wikipedia_id': '30786015', 'title': 'Ninjago: Masters of Spinjitzu (TV series)', 'start_paragraph_id': 163, 'start_character': 0, 'end_paragraph_id': 163, 'end_character': 336, 'bleu_score': 0.9210921090251241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15546827654451691114}, 'section': 'Section::::Broadcast and release.\n'}]}]