Question: what is the price of the most expensive painting in the world
[{'answer': 'Salvator Mundi', 'provenance': [{'wikipedia_id': '235235', 'title': 'List of most expensive paintings', 'start_paragraph_id': 1, 'start_character': 150, 'end_paragraph_id': 1, 'end_character': 164, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]