Question: who sold the most records elvis or the beatles
[{'answer': 'The Beatles', 'provenance': [{'wikipedia_id': '1291598', 'title': 'List of best-selling music artists', 'start_paragraph_id': 1, 'start_character': 837, 'end_paragraph_id': 1, 'end_character': 848, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9288', 'title': 'Elvis Presley', 'section': 'Section::::Achievements.\n', 'start_paragraph_id': 156, 'end_paragraph_id': 156, 'meta': {'evidence_span': ['Whitburn and "Billboard" concur that the Beatles hold the record for most number-one hits with 20, and that Mariah Carey is second with 18.', 'the Beatles']}}]}, {'provenance': [{'wikipedia_id': '1291598', 'title': 'List of best-selling music artists', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Beatles are considered the highest-selling band. Elvis Presley is considered the highest-selling individual artist based on sales claims and Rihanna is the highest-selling individual artist based on certified units.', 'based on both sales claims and certified units, The Beatles are considered the highest-selling band', 'The Beatles']}}]}]