Question: how many episode of walking dead season 7
[{'answer': '16', 'provenance': [{'wikipedia_id': '47562947', 'title': 'The Walking Dead (season 7)', 'start_paragraph_id': 1, 'start_character': 131, 'end_paragraph_id': 1, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]