<prompt> Which is a Chemoattractant -C5aClC3C2  <response>: Ans-C5a Major opsonins: C3b, IgG, mannose-binding lecithin MBL, fibronectin, fibrinogen, and CRP. Membrane attack complex: MAC has a subunit composition of C5b, C6, C7fC8, and polymeric C9 Anaphylatoxin: Both C3a and C5a anaphylatoxin activity. 