Question: who sings you're the one that i want in grease
[{'answer': 'John Travolta', 'provenance': [{'wikipedia_id': '2724169', 'title': "You're the One That I Want", 'start_paragraph_id': 1, 'start_character': 52, 'end_paragraph_id': 1, 'end_character': 65, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Olivia Newton - John', 'provenance': [{'wikipedia_id': '2724169', 'title': "You're the One That I Want", 'start_paragraph_id': 1, 'start_character': 70, 'end_paragraph_id': 1, 'end_character': 92, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]