CREATE TABLE table_18291 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

what's the party with candidates being silvio conte (r) unopposed
SELECT "Party" FROM table_18291 WHERE "Candidates" = 'Silvio Conte (R) Unopposed'
SELECT "Party" FROM "table_18291" WHERE "Candidates" = 'Silvio Conte (R) Unopposed'