CREATE TABLE table_731 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What's the district that Otto Passman is the incumbent of?
SELECT "District" FROM table_731 WHERE "Incumbent" = 'Otto Passman'
SELECT "District" FROM "table_731" WHERE "Incumbent" = 'Otto Passman'