Question: who wrote the song what child is this
[{'answer': 'William Chatterton Dix', 'provenance': [{'wikipedia_id': '2036276', 'title': 'What Child Is This?', 'start_paragraph_id': 1, 'start_character': 72, 'end_paragraph_id': 1, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'lyrics were written by William Chatterton Dix'}, {'provenance': [{'wikipedia_id': '2036276', 'title': 'What Child Is This?', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 558, 'bleu_score': 0.9792717993254391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16899716448719213250}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2036276', 'title': 'What Child Is This?', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['What Child Is This?" is a Christmas carol whose lyrics were written by William Chatterton Dix, in 1865.', '"What Child Is This?" is a Christmas carol whose lyrics were written by William Chatterton Dix, in 1865', '"What Child Is This?" is a Christmas carol whose lyrics were written by William Chatterton Dix, in 1865.']}}]}]