Question: where is the biggest tesco store in europe
[{'answer': 'Walkden', 'provenance': [{'wikipedia_id': '98356', 'title': 'Tesco', 'start_paragraph_id': 39, 'start_character': 245, 'end_paragraph_id': 39, 'end_character': 252, 'bleu_score': 1.0, 'section': 'Section::::UK operations.:Tesco Extra.\n'}]}, {'provenance': [{'wikipedia_id': '98356', 'title': 'Tesco', 'start_paragraph_id': 39, 'start_character': 0, 'end_paragraph_id': 39, 'end_character': 272, 'bleu_score': 0.829707400577911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16316426754489930762}, 'section': 'Section::::UK operations.:Tesco Extra.\n'}]}]