Question: who plays addison montgomery on grey's anatomy
[{'answer': 'Kathleen Erin Walsh'}, {'provenance': [{'wikipedia_id': '2172078', 'title': 'Kate Walsh (actress)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 323, 'bleu_score': 0.8910204091222941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4192130507139502976}, 'section': 'Section::::Abstract.'}]}]