African Sleeping Sickness Is Fatal If Not Treated Because the Parasite

Multiple Choice

African sleeping sickness is fatal if not treated because the parasite

A) produces a non-immunogenic toxin the immune system cannot neutralize.
B) reproduces so fast there is no time for an immune response to develop.
C) is an intracellular parasite in RBCʹs, where they are not detected by the immune system.
D) produces a toxin which binds irreversibly to neurons.
E) evades destruction by the immune system by changing surface antigens.