CREATE TABLE table_64110 ("Date Released" TEXT, "Polling institute" TEXT, "Socialist" TEXT, "Social Democratic" TEXT, "Green-Communist" TEXT, "People's Party" TEXT, "Left Bloc" TEXT, "Lead" TEXT)

What is the green-communist with a 15.5% lead?
SELECT "Green-Communist" FROM table_64110 WHERE "Lead" = '15.5%'
SELECT "Green-Communist" FROM "table_64110" WHERE "Lead" = '15.5%'