<prompt> The most common genetic cause of liver disease in children is -Haemochromatosisa1 antitrypsin deficiencyCystic fibrosisGlyocgen storage disease  <response>: Ans. is b i.e., a1-antitripsin deficiency o Amongst the given options ai antitrypsin deficiency is the best answer because neonatal hepatitis and extrahepatic biliary atresia are not there. 