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: Medicine
Cancer caused by chronic parasitic infection - 
Select and explain. 
A. Cholangiocarcinoma, B. Hepatic cell Ca, C. Ca GB, D. Ca pancreas
A: Cholangiocarcinoma
Answer: A: Cholangiocarcinoma 
Explanation: None