Question: who plays marty's sister in back to the future
[{'answer': 'Wendie Jo Sperber', 'provenance': [{'wikipedia_id': '5299314', 'title': 'List of Back to the Future characters', 'start_paragraph_id': 22, 'start_character': 26, 'end_paragraph_id': 22, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::McFly family.:Linda McFly.\n'}]}, {'provenance': [{'wikipedia_id': '5299314', 'title': 'List of Back to the Future characters', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 330, 'bleu_score': 0.968982777549629, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12489897476008629401}, 'section': 'Section::::McFly family.:Linda McFly.\n'}]}]