CREATE TABLE table_18337 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

what is the result where the candidates is robert l. f. sikes (d) unopposed?
SELECT "Result" FROM table_18337 WHERE "Candidates" = 'Robert L. F. Sikes (D) Unopposed'
SELECT "Result" FROM "table_18337" WHERE "Candidates" = 'Robert L. F. Sikes (D) Unopposed'