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
Bismuth classification for cholangiocarcinoma, type IV is 
Select and explain. 
A. Common hepatic duct, B. Bifurcation only, C. Bifurcation and B/L secondary intrahepatic ducts, D. Bifurcation and B/L right secondary intrahepatic ducts
C: Bifurcation and B/L secondary intrahepatic ducts
Answer: C: Bifurcation and B/L secondary intrahepatic ducts 
Explanation: Answer- C. Bifurcation and B/L secondary intrahepatic ducts