Question: whose portrait appears on the choir call to the right of the apse of san vitale ravenna
[{'answer': 'East Roman Emperor Justinian I', 'provenance': [{'wikipedia_id': '2658782', 'title': 'Basilica of San Vitale', 'start_paragraph_id': 15, 'start_character': 122, 'end_paragraph_id': 15, 'end_character': 152, 'bleu_score': 1.0, 'section': 'Section::::Mosaic art.:Justinian and Theodora panels.\n'}]}, {'provenance': [{'wikipedia_id': '2658782', 'title': 'Basilica of San Vitale', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 860, 'bleu_score': 0.986969988197764, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15477179246824226169}, 'section': 'Section::::Mosaic art.:Justinian and Theodora panels.\n'}]}]