Question: who wrote the song price tag by jessie j
[{'answer': 'Jessica Cornish'}, {'answer': 'Lukasz Gottwald'}, {'answer': 'Claude Kelly', 'provenance': [{'wikipedia_id': '30571239', 'title': 'Price Tag', 'start_paragraph_id': 1, 'start_character': 278, 'end_paragraph_id': 1, 'end_character': 290, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Bobby Ray Simmons , Jr .'}]