【单选题】
A <{p}>It targets specific threats to the body.<{br/}><{/p}>
B <{p}>People are not born with it.<{br/}><{/p}>
C <{p}>It works more efficiently towards any threat than innate immunity.<{br/}><{/p}>
D <{p}>It is more complex than innate immunity.<{br/}><{/p}>
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