Question: who did vincent van gogh sell his painting to
[{'answer': 'Anna Boch', 'provenance': [{'wikipedia_id': '459600', 'title': 'The Red Vineyard', 'start_paragraph_id': 4, 'start_character': 163, 'end_paragraph_id': 4, 'end_character': 172, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '459600', 'title': 'The Red Vineyard', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 429, 'bleu_score': 0.928680631194693, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2606122722634396649}, 'section': 'Section::::History.\n'}]}]