<prompt> Which one of the following is not a Pyridoxine Dependent disorderHomocystinuriaMethyl-malonic-acidemiaCystathioninuriaXanthurenic aciduria  <response>: Methylmalonic acidemia is an autosomal recessive disorder of amino acid metabolism, involving a defect in the conversion of methylmalonyl-coenzyme A CoA to succinyl-CoA. Patients typically present at the age of 1 month to 1 year with neurologic manifestations, such as seizure, encephalopathy, and stroke. Reference: GHAI Essential pediatrics, 8th edition 