Question: who plays richard webber on grey's anatomy
[{'answer': 'James Pickens Jr.', 'provenance': [{'wikipedia_id': '4008975', 'title': 'James Pickens Jr.', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4008975', 'title': 'James Pickens Jr.', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 308, 'bleu_score': 0.945923367827719, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9581894243639969547}, 'section': 'Section::::Abstract.'}]}]