Question: who sings lead on i saw her standing there
[{'answer': 'Paul McCartney', 'provenance': [{'wikipedia_id': '2253826', 'title': 'I Saw Her Standing There', 'start_paragraph_id': 1, 'start_character': 86, 'end_paragraph_id': 1, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]