What specific challenge does Trypanosoma brucei present to the immune system?
A. It frequently changes its antigens, staying one step ahead of the host's antibody response.
B. It specifically attacks T lymphocytes preventing their activation and crippling the cell-mediated immune response.
C. It specifically attacks B lymphocytes preventing activation and antibody production.
D. Its antigens are not recognized by B and T lymphocytes so these host defense cells don't respond to the infection.
Answer: A
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