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
M/C site of cholangio CA: 
Select and explain. 
A. ntrahepatic, B. Distal biliary tract, C. Hilum, D. Multifocal
C: Hilum
Answer: C: Hilum 
Explanation: Hilum Risk factor for cholangio carcinoma * Primary sclerosing cholangitis * Choledochal cyst * Ulcerative colitis * Clonorchis sinensis injection * Chronic typhoid carries 2/3 of cholangio carcinoma are located at hepatic duct bifurcation here they are called as KLATSKIN's tumoursQ M/C type is adeno carcinomaQ *Painless jaundice is the most common presentation