All of these are virulence factors that allow helicobacter pylori to colonize the stomach except

I believe the answer for the above question is Hemolysins. 
Helicobacter pylori is a bacterium that causes chronic inflammation in the stomach and duodenum and is the common cause of the chronic inflammation in the stomach. It causes chronic inflammation (gastritis) by invading the lining of the stomach and producing a cytotoxin; vacuolating cytotoxin A, and therefore, can lead to formation of ulcer.

Ifound this information on google “yes. they have a mouth and brain at one end and an anus at the opposite end. what characteristics distinguish an annelid from other worms? annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.“ i hope it you

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.