Question: who played april kepner on grey's anatomy
[{'answer': 'Sarah Drew', 'provenance': [{'wikipedia_id': '3569434', 'title': 'Sarah Drew', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3569434', 'title': 'Sarah Drew', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 0.7251943914187, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2310267554079213345}, 'section': 'Section::::Abstract.'}]}]