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Question
If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?
Options:
A .  The disease organism itself and antigens for the disease organism
B .  A very high level of antibodies against the disease antigens
C .  Memory B lymphocytes for the antigen of this disease organism
D .  All of the above
Answer: Option D
Answer: (d).All of the above

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