Question: who won song of the year at oscars
[{'answer': 'Kristen Anderson - Lopez'}, {'answer': 'Robert Lopez', 'provenance': [{'wikipedia_id': '24128375', 'title': 'Academy Award for Best Original Song', 'start_paragraph_id': 55, 'start_character': 15, 'end_paragraph_id': 55, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Records.:Winners of multiple awards.\n'}]}]