Question: when does walking dead season 8 second half start
[{'answer': 'October 22 , 2017', 'provenance': [{'wikipedia_id': '49550011', 'title': 'The Walking Dead (season 8)', 'start_paragraph_id': 1, 'start_character': 116, 'end_paragraph_id': 1, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'February 25 , 2018'}, {'provenance': [{'wikipedia_id': '49550011', 'title': 'The Walking Dead (season 8)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 489721585498670607}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49550011', 'title': 'The Walking Dead (season 8)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 572, 'bleu_score': 0.9045914187152131, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 489721585498670607}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49550011', 'title': 'The Walking Dead (season 8)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The eighth season of "The Walking Dead", an American post-apocalyptic horror television series on AMC, premiered on October 22, 2017, and concluded on April 15, 2018, consisting of 16 episodes.', 'The eighth season of "The Walking Dead", an American post-apocalyptic horror television series on AMC, premiered on October 22, 2017, and concluded on April 15, 2018, consisting of 16 episodes.', 'The eighth season of "The Walking Dead", an American post-apocalyptic horror television series on AMC, premiered on October 22, 2017, and concluded on April 15, 2018, consisting of 16 episodes. Developed for television by Frank Darabont, the series is based on the eponymous series of comic books by Robert Kirkman, Tony Moore, and Charlie Adlard. The executive producers are Kirkman, David Alpert, Scott M. Gimple, Greg Nicotero, Tom Luse, and Gale Anne Hurd, with Gimple as showrunner for his fifth and final season. The eighth season received mixed reviews from critics. It was nominated for multiple awards and won two, including Best Horror Television Series for the third consecutive year, at the 44th Saturn Awards.']}}]}]