CREATE TABLE table_43856 ("Year" FLOAT, "Men's singles" TEXT, "Women's singles" TEXT, "Men's doubles" TEXT, "Women's doubles" TEXT, "Mixed doubles" TEXT)

Which men's singles has mixed doubles with Kevin Cao Melody Liang?
SELECT "Men's singles" FROM table_43856 WHERE "Mixed doubles" = 'kevin cao melody liang'
SELECT "Men's singles" FROM "table_43856" WHERE "Mixed doubles" = 'kevin cao melody liang'