This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
True about Extrahepatic binary atresia – 
Select and explain. 
A. Acholic stool, B. Conjugated hyperbilirubinemia, C. Absence of nucleide in duodenum in HIDA scan, D. All of these
D: All of these
Answer: D: All of these 
Explanation: Extrahepatic binary atresia 

Biliary Atresia is the absence of patent bile duct draning the liver.
The abnormality found most commonly is complete atresia of extrahepatic biliary structures.
Infants with biliary atresia often has an uneventful neonatal course until jaundice is noted at 2-3 weeks of age.
Conjugated hyperbilirubinemia occurs.
Urine is dark in colour
Stools may be normal or clay coloured (acholic).
The liver may be of normal size early, but it becomes enlarged with time.
Liver becomes hard as a consequence of progressive cirrhosis
Splenomegally is usually seen

Laboratory findings

Direct bilirubin levels over 3 mg/dl
Alkaline phosphatase elevated to 500-1000 units/L
Gamma Glutamyl transpeptidase levels > 300 units/L

Imaging studies

Absence or inability to visualize a contracted gall bladder on USG
Serial Scintiscans of right upper abdomen should be obtained after injection of Technitium Tc 99m. labeled iminodiacetate. Compounds (IDA, HIDA, PIPIDA) --> Liver fails to secret these compounds into the duodenum due to biliary obstruction.
Needle biopsy of the liver - If bleeding and clotting tests are normal.