Question: who plays jackson avery in grey's anatomy
[{'answer': 'Jesse Wesley Williams', 'provenance': [{'wikipedia_id': '15329914', 'title': 'Jesse Williams (actor)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]