<prompt> Cholangiocarcinoma is caused by -a Fasciola infestationb Clonorchis infestationc Paragonimus infestationd Ascaris infestatione None of theseacabadbc  <response>: ParasitesSchistosoma haematobiumClonorchis sinensisOpisthorchis viverriniMalignancySquamous cell carcinoma of urinary bladderCholangiocarcinoma of liver, bile duct and Adenocarcinoma of pancreasCholangiocarcinoma of bile duct 