If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?

Question: If a person is vaccinated against a disease sometime in the past, which of the following is currently in your body?
[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

Explanation:

No answer description available for this question.