Which parasitic protist evades the host immune system by altering its surface proteins with each generation?

Which parasitic protist evades the host immune system by altering its surface proteins with each generation? 




a. Paramecium caudatum
b. Trypanosoma brucei
c. Plasmodium falciparum
d. Phytophthora infestans


Answer: b. Trypanosoma brucei


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