Question: who are the surviving members of the beatles
[{'answer': 'McCartney', 'provenance': [{'wikipedia_id': '29812', 'title': 'The Beatles', 'start_paragraph_id': 1, 'start_character': 100, 'end_paragraph_id': 1, 'end_character': 109, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Starr', 'provenance': [{'wikipedia_id': '29812', 'title': 'The Beatles', 'start_paragraph_id': 1, 'start_character': 137, 'end_paragraph_id': 1, 'end_character': 142, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]