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
Commonest cause for bile duct infection is which of the following condition ? 
Select and explain. 
A. Clonorchis, B. Common Bile Duct stone, C. Periampullary Ca, D. Ca head of pancreas
B: Common Bile Duct stone
Answer: B: Common Bile Duct stone 
Explanation: Charcoat's cholangitis triad, a feature of bile duct infection, consists of pain, fever and jaundice.