It can build immunity is the correct option. Thus option A is correct.
Immunity is the ability of an individual to detect and discriminate between "self" molecules found in one's own body and "nonself" molecules found in pathogenic microbes and poisons. There is a significant genetic component to this process.
Even if some STIs can be recognized and treated, reinfection is still a possibility. Failure to finish treatment, having a partner who is not treated, and not practicing safe intimate are all typical ways for people to re-infect.
Learn more about STIs here:
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