Question: who played jefferson in once upon a time
[{'answer': 'Sebastian Stan', 'provenance': [{'wikipedia_id': '9110929', 'title': 'Sebastian Stan', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9110929', 'title': 'Sebastian Stan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 359, 'bleu_score': 0.9657992495762461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4935896542236126325}, 'section': 'Section::::Abstract.'}]}]