Question: when does the defender series start on netflix
[{'answer': 'August 18 , 2017', 'provenance': [{'wikipedia_id': '42721570', 'title': 'List of Marvel Cinematic Universe television series', 'start_paragraph_id': 41, 'start_character': 635, 'end_paragraph_id': 41, 'end_character': 651, 'bleu_score': 1.0, 'section': 'Section::::Netflix series.:"Marvel\'s The Defenders" (2017).\n'}]}]