This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transplantation, Subject name: Surgery
Most common indication for liver transplantation in children- 
Select and explain. 
A. Biliary atresia, B. PBC, C. PSC, D. Caroli's disease
A: Biliary atresia
Answer: A: Biliary atresia 
Explanation: Ans. is 'a' i.e.. Biliary atresia