Question: who taught john travolta to dance in saturday night fever
[{'answer': 'Denis George Mahan', 'provenance': [{'wikipedia_id': '5210959', 'title': 'Deney Terrio', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5210959', 'title': 'Deney Terrio', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 472, 'bleu_score': 0.6364873252267641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10928948803711924834}, 'section': 'Section::::Abstract.'}]}]