Question: who sang the original version of i can only imagine
[{'answer': 'MercyMe', 'provenance': [{'wikipedia_id': '2867531', 'title': 'I Can Only Imagine (MercyMe song)', 'start_paragraph_id': 0, 'start_character': 20, 'end_paragraph_id': 0, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]