Question: who is the biggest selling british artist of all time
[{'answer': 'The Beatles', 'provenance': [{'wikipedia_id': '24232722', 'title': 'List of biggest selling British acts of all time', 'start_paragraph_id': 11, 'start_character': 275, 'end_paragraph_id': 11, 'end_character': 286, 'bleu_score': 1.0, 'section': 'Section::::Constraints.\n'}]}]