**Active immunity** is acquired when:
AReady-made antibodies are received from another source (e.g. mother's milk)
BBody produces its own antibodies after exposure to antigen (infection or vaccination)
COnly via blood transfusion
DAntibiotics are taken
Answer & Solution
Correct answer: B. Body produces its own antibodies after exposure to antigen (infection or vaccination)
Active immunity: body's own B cells produce antibodies after antigen exposure (natural infection or vaccination). Slow to develop, long-lasting (memory cells). Passive immunity: pre-formed antibodies given (mother's IgG via placenta, IgA in milk, antitoxin shots) — immediate but short-lived.
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