<prompt> In metabolism of xenobiotics, all of the following reactions occur in phase one except:OxidationReductionConjugationHydrolysis  <response>: Metabolic reactions may be classified into phase I non-synthetic and phase II synthetic reactions. Phase I reactions include oxidation, reduction, hydrolysis, cyclization and decylization etc. whereas phase II reactions include glucuronidation, acetylation,methylation, sulfation and glycine conjugation etc. 