user: Question: Which artist's work is the butterfly Tiger Swallowtail?
Columns: ['Year', 'Butterfly', 'Artist', 'Mintage', 'Issue Price', 'Finish']
Types: ['real', 'text', 'text', 'real', 'text', 'text']
Sample row: [2004.0, 'Tiger Swallowtail', 'Jianping Yan', 19910.0, '$39.95', 'Hologram']
SQL:

assistant: SELECT "Artist" FROM "Table" WHERE "Butterfly" = 'Tiger Swallowtail';