<prompt> Pegvaliase was approved by FDA in 2018 forPhenylketonuriaPancreatic tumoursCrohns diseaseGlycogen storage disorders  <response>: Pegvaliase is a drug approved for the treatment of phenylketonuria. Chemically, it is a pegylated derivative of the enzyme phenylalanine ammonia-lyase that metabolizes phenylalanine to reduce its blood levels. 