CREATE TABLE table_18410 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

what's incumbent with district being tennessee 5
SELECT "Incumbent" FROM table_18410 WHERE "District" = 'Tennessee 5'
SELECT "Incumbent" FROM "table_18410" WHERE "District" = 'Tennessee 5'