Which describes acquired passive immunity?

• A. The body manufactures its own antibodies after exposure.
• B. It is long-lasting and lifelong.
• C. It involves receiving antibodies produced in another individual's body.
• D. It is induced by vaccines.

Answer: (B)

Acquired passive immunity is protection that comes from antibodies produced by someone else, not by your own immune system. It provides rapid protection but is temporary because those borrowed antibodies are eventually cleared and no memory is formed. Examples include antibodies transferred from mother to fetus during pregnancy or via breast milk, and therapeutic antibodies given in medical treatment. It is not induced by vaccines, which stimulate your own immune system to make antibodies and develop memory. So the best description is the one that involves receiving antibodies produced in another individual's body, since that captures the idea of passive transfer and lack of lasting memory.