Question: who played the boy in the plastic bubble
[{'answer': 'John Travolta', 'provenance': [{'wikipedia_id': '2133173', 'title': 'The Boy in the Plastic Bubble', 'start_paragraph_id': 1, 'start_character': 180, 'end_paragraph_id': 1, 'end_character': 193, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2133173', 'title': 'The Boy in the Plastic Bubble', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 40, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6858355662159189041}, 'section': 'Section::::Main cast.\n'}]}]