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 the following parasites cause malignancy except 
Select and explain. 
A. Schistosoma haematobium, B. Clonorchis sinensis, C. Opisthrochis viverrini, D. Onchocerca volvulus
D: Onchocerca volvulus
Answer: D: Onchocerca volvulus 
Explanation: S. haematobium - SCC of urinary bladder
C. Sinensis - Cholangiocarcinoma of liver, bileduct.
O. Viverrini - Cholangiocarcinoma of bileduct.