Question: who does emma watson play in the perks of being a wallflower
[{'answer': 'Sam', 'provenance': [{'wikipedia_id': '30265620', 'title': 'The Perks of Being a Wallflower (film)', 'start_paragraph_id': 6, 'start_character': 27, 'end_paragraph_id': 6, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '30265620', 'title': 'The Perks of Being a Wallflower (film)', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 772, 'bleu_score': 0.5931243380780611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17926964661686343240}, 'section': 'Section::::Plot.\n'}]}]