43. Which two genera have members that can evade the human immune system by frequently changing their surface proteins?
(1) Plasmodium
(2) Trichomonas
(3) Paramecium
(4) Trypanosoma
(5) Entamoeba
(A) 1 and 2 (B) 1 and 4 (C) 2 and 3 (D) 2 and 4 (E) 4 and 5