<prompt> Phenylalanemia I is due to deficiency of ?Phenylalanine hydroxylaseHomogentisate oxidaseTyrosinaseNone  <response>: Phenylalanine hydroxylase i Classical phenylketonuria hyperphenylalanemia type I Deficiency of phenylalanine hydroxylase.ii Atypical phenylketonuria hyperphenylalanemia type II and III Defect in dihydrobiopterin reductase.iii Hyperphenylalanemia type IV and V Defect in dihydrobiopterin synthesis. 