<prompt> A child has tnicrocephaly, blue eyes, Fair skin, and Mental retardation, Ferric chloride test is positive.What is the likely diagnosis -Phenylketonuria PKUHomocystinuriaTyrosinosisAlkaptonuria  <response>: Clinical manifestations of phenylketonuria Normal at birthSymptoms occur after 1 months -Mental retardation Not present at birth, develops gradually.Neurological signs Irritability, tremors, convulsions, hyperkinesis and muscular hypertonia exaggerated reflex.Blond hair, blue iris, fair skin.Musty or mousy body odor.VomitingMicrocephalyEnamel hypoplasia Growth retardation 