Question: Mound of Butter is a painting by the 19th-century by which French realist painter, made between 1875 and 1885, the painting is hosted at The National Gallery of Art, and its attached Sculpture Garden, is a national art museum in Washington, D.C., located on the National Mall, between 3rd and 9th Streets, at Constitution Avenue NW?
{'answer': 'Antoine Vollon', 'supporting_facts': [['Mound of Butter', 0], ['National Gallery of Art', 0]]}