Which Compounds Are Recognized by the Activating Receptors of Macrophages

Multiple Choice

Which compounds are recognized by the activating receptors of macrophages as foreign antigens?

A) the lipopolysaccharides of gram-negative bacteria
B) the peptidoglycans of gram-positive bacteria
C) the lipopolysaccharides of gram-negative bacteria and the peptidoglycans of gram-positive bacteria
D) none of these