Question: who played alex drake on pretty little liars
[{'answer': 'Troian Avery Bellisario', 'provenance': [{'wikipedia_id': '25373967', 'title': 'Troian Bellisario', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25373967', 'title': 'Troian Bellisario', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 612, 'bleu_score': 0.7272244088836901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5990769661756712585}, 'section': 'Section::::Abstract.'}]}]