This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro Intestinal System, Subject name: Pediatrics
[{'content': 'In neonatal cholestasis, if the serum gamma glutamyl- transpeptidase (GGT) is more than 600 IU/L the most likely diagnosis is: \nSelect and explain. \nA. Neonatal hepatitis, B. Choledochal cyst, C. Sclerosing cholangitis, D. Biliary atresia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D. Biliary atresia(Ref: Nelson\'s 20/e p 1933)3 Enzymes reflect cholestasis: Alkaline phosphatase, 5\'nucleotidase & Gamma glutamyl transpeptidase.About GGT in Cholestasis: (Normal value of GGT is 5-40IU/L)"GGT levels are commonly elevated to values more than 10 times normal in biliary atresia while in hepatic causes it is raised to about three times normal"Thus a value of 600IU/L in the patient in question reflects an elevation of more than ten times the normal value. The patient is thus likely suffering from \'biliary atresia\'.', 'role': 'assistant'}]