Question: who is the singer of mumford and sons married to
[{'answer': 'Carey Mulligan', 'provenance': [{'wikipedia_id': '29078929', 'title': 'Marcus Mumford', 'start_paragraph_id': 18, 'start_character': 26, 'end_paragraph_id': 18, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::Personal life.\n'}]}]