What are the most likely incriminated parasites?

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A link between exposure of Vietnam Veterans to parasite during their military service in Southeast Asia and development of cholangiocarcinoma five decades after primary infection has been suggested. What are the most likely incriminated parasites?   A. Schistosoma mansoni and S. japonicum   B. Entamoeba histolytica and E. dispar   C. Clonorchis sinensis and Opisthorchis viverrini   D. Fasciola hepatica and F. gigantic    E. Plasmodium falciparum and P. vivax