Question: who wrote ob la di ob la da
[{'answer': 'Paul McCartney', 'provenance': [{'wikipedia_id': '1758815', 'title': 'Ob-La-Di, Ob-La-Da', 'start_paragraph_id': 1, 'start_character': 164, 'end_paragraph_id': 1, 'end_character': 178, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]