<prompt> A 6 month old baby presents with bilateral cataract. A urine test is requested to suspect:HomocystinuriaGalactosemiaHyperlysinemiaSulfite oxidase deficiency  <response>: Ans. b GalactosemiaRef: Parsons 22e, p. 273Laboratory investigations for the diagnosis of bilateral, non- hereditary pediatric cataractBlood testSerum biochemistry for levels of blood glucose, calcium and phosphorusRed blood cell transferase and galactokinase levelsSerology for estimating the tiers of antibody for infections such as toxoplasmosis, rubella, cytomegalovirus and herpes simplex virus TORCH and hepatitis B virusUrine testUrine assay for the presence of reducing substances after milk feeding for galactosaemiaScreening for amino acids in the urine if Lowe syndrome is suspected 