19. (選擇題) What's correct?
(A) Schistosoma japonicum can infect human by penetrating skin while contacting the contaminated water,
(B) Trypanosoma brucei is the etiology for the Chagas' disease,
(C) The cysticercus of Taenia saginata encysts in the muscles of pigs,
(D) all of above. (2.5 分)

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