user: Question: What is the Grade that has Turf 1600m?
Columns: ['!Race name', 'Grade', 'Racecourse', 'Distance', 'Priority-entry-rights to Derby']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Satsuki Shō', 'GI', 'Nakayama', 'Turf 2000m']
SQL:

assistant: SELECT "Grade" FROM "Table" WHERE "Priority-entry-rights to Derby" = 'Turf 1600m';