Question: who was the artist who cut off his ear
[{'answer': 'Van Gogh', 'provenance': [{'wikipedia_id': '32603', 'title': 'Vincent van Gogh', 'start_paragraph_id': 2, 'start_character': 40, 'end_paragraph_id': 2, 'end_character': 48, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32603', 'title': 'Vincent van Gogh', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 685, 'bleu_score': 0.9485495426391891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12040639507651055609}, 'section': 'Section::::Abstract.'}]}]