Question: oil painting has been the medium of choice for painter since
[{'answer': 'the late 15th century', 'provenance': [{'wikipedia_id': '22605', 'title': 'Oil painting', 'start_paragraph_id': 10, 'start_character': 671, 'end_paragraph_id': 10, 'end_character': 692, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '22605', 'title': 'Oil painting', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 922, 'bleu_score': 0.9866213202385071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13049059702093577965}, 'section': 'Section::::History.\n'}]}]