An example of an antigen that could stimulate naïve B-cell proliferation and differentiation without the help of a T cell would be a(n) ________ molecule from ________.
A) lipopolysaccharide; Proteus vulgaris B) plasmid DNA; Yersinia pestis C) protein A; Staphylococcus aureus D) anthrax toxin; Bacillus anthracis E) porin protein; Escherichia coli