CREATE TABLE table_45021 ("Antibody" TEXT, "Brand name" TEXT, "Approval date" FLOAT, "Type" TEXT, "Target" TEXT)

What's the target of the antibody rituximab?
SELECT "Target" FROM table_45021 WHERE "Antibody" = 'rituximab'
SELECT "Target" FROM "table_45021" WHERE "Antibody" = 'rituximab'