Question: who is the artist of the painted the old guitarist
[{'answer': 'Pablo Picasso', 'provenance': [{'wikipedia_id': '2826896', 'title': 'The Old Guitarist', 'start_paragraph_id': 1, 'start_character': 40, 'end_paragraph_id': 1, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2826896', 'title': 'The Old Guitarist', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 362, 'bleu_score': 0.7607475240586411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13558729260286228257}, 'section': 'Section::::Abstract.'}]}]