Question: who plays tristan oswald in sons of anarchy
[{'answer': 'Liana Daine Liberato', 'provenance': [{'wikipedia_id': '12283768', 'title': 'Liana Liberato', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12283768', 'title': 'Liana Liberato', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 214, 'bleu_score': 0.8492988135354751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9744663190055865087}, 'section': 'Section::::Abstract.'}]}]