Question: who plays lexi grey in grey's anatomy
[{'answer': 'Chyler Leigh', 'provenance': [{'wikipedia_id': '1718782', 'title': 'Chyler Leigh', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1718782', 'title': 'Chyler Leigh', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 368, 'bleu_score': 0.815303880643873, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7051798573157292526}, 'section': 'Section::::Abstract.'}]}]