Question: who plays sam and dean's dad on supernatural
[{'answer': 'Jeffrey Dean Morgan', 'provenance': [{'wikipedia_id': '7290639', 'title': 'John Winchester (Supernatural)', 'start_paragraph_id': 1, 'start_character': 217, 'end_paragraph_id': 1, 'end_character': 236, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7290639', 'title': 'John Winchester (Supernatural)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 308, 'bleu_score': 0.8964173245779281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6476974174533584388}, 'section': 'Section::::Abstract.'}]}]