Question: who played tight end for the dallas cowboys
[{'answer': 'Christopher Jason Witten', 'provenance': [{'wikipedia_id': '1266254', 'title': 'Jason Witten', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1266254', 'title': 'Jason Witten', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 510, 'bleu_score': 0.7705317579206841, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15983376971150737063}, 'section': 'Section::::Abstract.'}]}]