CREATE TABLE table_39485 ("Name" TEXT, "Pennant number" TEXT, "Ordered" FLOAT, "Builder" TEXT, "Commissioned" TEXT)

Which Builder has a Pennant number of Q149?
SELECT "Builder" FROM table_39485 WHERE "Pennant number" = 'q149'
SELECT "Builder" FROM "table_39485" WHERE "Pennant number" = 'q149'