Question: who won the superbowl in the year 1970
[{'answer': 'Kansas City Chiefs', 'provenance': [{'wikipedia_id': '29130', 'title': 'Super Bowl IV', 'start_paragraph_id': 1, 'start_character': 224, 'end_paragraph_id': 1, 'end_character': 242, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '29130', 'title': 'Super Bowl IV', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 465, 'bleu_score': 0.9178987684271681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1411550871646853210}, 'section': 'Section::::Abstract.'}]}]