Question: who did ed sheeran wrote nancy mulligan about
[{'answer': 'William Sheeran', 'provenance': [{'wikipedia_id': '52850356', 'title': 'Nancy Mulligan', 'start_paragraph_id': 3, 'start_character': 108, 'end_paragraph_id': 3, 'end_character': 123, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'answer': 'Anne Mulligan', 'provenance': [{'wikipedia_id': '52850356', 'title': 'Nancy Mulligan', 'start_paragraph_id': 3, 'start_character': 199, 'end_paragraph_id': 3, 'end_character': 212, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '52850356', 'title': 'Nancy Mulligan', 'start_paragraph_id': 3, 'start_character': 15, 'end_paragraph_id': 3, 'end_character': 709, 'bleu_score': 0.9214555597278651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12347255666702076663}, 'section': 'Section::::Background.\n'}]}]