user: Question: What is the Mountain Pass with a 21 Rank?
Columns: ['Rank', 'Mountain Pass', 'Elevation', 'Surface', 'Route']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'Independence Pass', '12,103 feet 3689 m', 'asphalt', 82.0]
SQL:

assistant: SELECT "Mountain Pass" FROM "Table" WHERE "Rank" = 21.0;