Question: when is the last walking dead episode 2017
[{'answer': 'April 2 , 2017', 'provenance': [{'wikipedia_id': '47562947', 'title': 'The Walking Dead (season 7)', 'start_paragraph_id': 1, 'start_character': 152, 'end_paragraph_id': 1, 'end_character': 166, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]