Question: who sang do they know it's christmas 1984
[{'answer': 'Band Aid', 'provenance': [{'wikipedia_id': '848102', 'title': "Do They Know It's Christmas?", 'start_paragraph_id': 1, 'start_character': 217, 'end_paragraph_id': 1, 'end_character': 225, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]