CREATE TABLE table_name_27 (grade VARCHAR, priority_entry_rights_to_derby VARCHAR)

What is the Grade that has Turf 1600m?
SELECT grade FROM table_name_27 WHERE priority_entry_rights_to_derby = "turf 1600m"
SELECT "grade" FROM "table_name_27" WHERE "priority_entry_rights_to_derby" = "turf 1600m"