5. Please choose a statement that is not true for microbial toxins.
(A) In AB toxins, the "A" component is responsible for binding to a host cell receptor, while the "B" component has enzyme activity to cause toxicity.
(B) An endotoxin is the lipopolysaccharides derived from the outer membrane of Gram-negative bacteria, and its toxic component is the lipid A portion.
(C) Aflatoxins are produced by fungi and carcinogenic to cause liver cancer.
(D) Superantigens are heat-labile exotoxins and can stimulate nearly 30% of T cells to overexpress and release large amounts of cytokines without a specific antigen.
(E) Botulinum toxin is a neurotoxin binding to the same target as tetanus toxin.