<prompt> Causes of neuroregression in a child can be all except ?Wilsons diseaseVitamin B12 deficiencyADHDAtaxia telengiectasia  <response>: Ans. C. ADHDCauses of neuroregressionInheritedA. GreY matter involvement-With visceromegaly :- Niemann pick disease, Sandholf disease GM2, sialidosis, Goucherdisease, Mucopolyschharidoses MPSWithout visceromegaly :- TaySach Disease, Rett syndrome, Menkes kinky hair diseaseB. White matter involvement:-Leukodystrophies :- Metachromatic leukodystrophy, Krebbes disease, Adrenoleukodytrophy, Alexander disease, Cannavan disease .AcquiredDemyelinating:-Multiplesclerosis,schildersdisease,DevicdiseaseC. Basal ganglia involvement - Wilsons disease, Dystonia muscular deformans, Huntingtons diseaseD. Spinocerebeller :- Friedrichs ataxia, Ataxia telengiectasisE. AcquiredInfections:- SSPE, progressive rubella syndrome, HIVMetabolic:Chronicleadpoisoning,Hypothyoidism,VitB12Edeficienry,Drugsanticonvulsants. 