Antigens multiple choice question

Antigens
A. Are usually proteins or polypeptide molecules.
B. Can only be recognized by immune system cells previously exposed to that antigen.
C. Are normally absorbed from the gut via lymphatics and carried to mesenteric lymph
nodes.
D. Induce a smaller immune response when protein synthesis is suppressed.
E. Are taken up by antigen-presenting macrophages which activate the immune system.