CREATE TABLE table_27136 ("Round" CLOB, "Circuit" CLOB, "Date" CLOB, "Class A Winner" CLOB, "Class B Winner" CLOB, "Class C Winner" CLOB, "Class D Winner" CLOB)

Who was the Class D winner in round 6?
SELECT "Class D Winner" FROM table_27136 WHERE "Round" = '6'
SELECT "Class D Winner" FROM "table_27136" WHERE "Round" = '6'