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: Microbiology
All of the following are known to cause biliary obstruction EXCEPT: March 2013 
Select and explain. 
A. Clonorchis, B. Ascariasis, C. Ancylostoma, D. Fasciola
C: Ancylostoma
Answer: C: Ancylostoma 
Explanation: Ans. C i.e. Ancylostoma Site of locution of Ancylostoma is small intestine