Which of the following is an agent?

Poll created by 2444256703 on Apr 8, 2015
Which of the following is an agent (e.g. aluminum salts, oil-based, virosomes) oftenused to modify or augment the effects of a vaccine by stimulating the immune system torespond to the vaccine more vigorously, and thus providing increased immunity to a particular disease?
A.Antigen
B.Epitope
C.Immunogen
D.Stimulant
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