Question: which english football team has been in the top flight the longest
[{'answer': 'Everton', 'provenance': [{'wikipedia_id': '600417', 'title': 'Football records and statistics in England', 'start_paragraph_id': 12, 'start_character': 61, 'end_paragraph_id': 12, 'end_character': 68, 'bleu_score': 1.0, 'section': 'Section::::League.:Top-flight appearances.\n'}]}]