Which one of the following is NOT a characteristic of the innate immune system?
A. It acts immediately or within hours of appropriate stimulus.
B. Its response is enhanced on repeated exposure to pathogen
C. It involves granulocytes.
D. It involves one type of large, granular lymphocytes.
E. It involves macrophages.
Ans: B. Its response is enhanced on repeated exposure to pathogen
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a. true b. false