Question: who wrote the song castle on the hill
[{'answer': 'Ed Sheeran', 'provenance': [{'wikipedia_id': '52788520', 'title': 'Castle on the Hill', 'start_paragraph_id': 1, 'start_character': 60, 'end_paragraph_id': 1, 'end_character': 70, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Benjamin Levin'}]