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: Surgery
In choledochal cyst, most common type is: 
Select and explain. 
A. Type 1, B. Type 2, C. Type 4, D. Type 4A
A: Type 1
Answer: A: Type 1 
Explanation: Type 1 is the most common type and constitute about 50% of the choledochal cysts. Type 5 is dilation confined to intrahepatic bile ducts (caroli's disease). Ref: Sabiston, 18th Edition, Page 1577