Question: who plays susan grey on grey's anatomy
[{'answer': 'Winningham', 'provenance': [{'wikipedia_id': '2316999', 'title': 'Mare Winningham', 'start_paragraph_id': 0, 'start_character': 5, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2316999', 'title': 'Mare Winningham', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 822, 'bleu_score': 0.9536340399923071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18259283637372220964}, 'section': 'Section::::Career.:Acting.\n'}]}]