This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
Cholangiocarcinoma is caused by - 
Select and explain. 
A. Giardia lamblia, B. Clonorchis infestation, C. Paragonimus infestation, D. Ascaris infestation
B: Clonorchis infestation
Answer: B: Clonorchis infestation 
Explanation: Ans. is 'b' i.e., Clonorchis infestation Parasites associated with malignancyo Clonorchis sinensis-Liver, bile duct (cholangiocarcinoma) and Pancreas (adenocarcinoma)o Opisthorchis viverrini-Bile duct (chalangio carcinoma)o Schistosoma haematobium-Urinary bladder (squamous cell Ca)o Fasciola hepatica-Cholangiocarcinoma