user: Question: When was the Oakachoy Covered Bridge listed?
Columns: ['Name', 'Built', 'Listed', 'Location', 'County']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Clarkson Bridge', '1904', '1974-06-25', 'Cullman', 'Cullman']
SQL:

assistant: SELECT "Listed" FROM "Table" WHERE "Name" = 'Oakachoy Covered Bridge';