Question: who does kristen stewart play in into the wild
[{'answer': 'Tracy Tatro', 'provenance': [{'wikipedia_id': '11893755', 'title': 'Into the Wild (film)', 'start_paragraph_id': 8, 'start_character': 133, 'end_paragraph_id': 8, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]