Question: who is the actor that plays casey on chicago fire
[{'answer': 'Jesse Gordon Spencer', 'provenance': [{'wikipedia_id': '2095536', 'title': 'Jesse Spencer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2095536', 'title': 'Jesse Spencer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 330, 'bleu_score': 0.7856439849513961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7915479107833143781}, 'section': 'Section::::Abstract.'}]}]